feat(debug): add debug read with CSV export

- Parse F1 debug data via family-independent temp formula
  (bits 4-14 scaled by 2**(i-8), sign at bit 0)
- Save sensor+debug temps side-by-side to debug_info.csv
- Wire READ DEBUG button in StatusActionsPanel
- Rename ReplayChart → RunChart; move into GraphTab
- Extract PanelBox/SectionTitle/PanelSlider in ReadoutPanel
  to cut ~300 lines of duplicated styling
- Add rightRailWidth token to Theme for consistent rail sizing
- Wrap ReadoutPanel in ScrollView so Thresholds card stays
  reachable when E-C delta rows appear

src/pygui/ISC/AboutDialog.qml

@@ -9,8 +9,8 @@ Popup {
     modal: true
     dim: true
     closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside
-    width: 480
-    height: 440
+    width: 600
+    height: 500
     anchors.centerIn: Overlay.overlay
 
     onOpened: licenseModel.refresh()
@@ -31,8 +31,8 @@ Popup {
 
     ColumnLayout {
         anchors.fill: parent
-        anchors.margins: 24
-        spacing: 16
+        anchors.margins: 28
+        spacing: 20
 
         // ── Title ──
         Label {
@@ -44,27 +44,20 @@ Popup {
 
         // ── App info ──
         ColumnLayout {
-            spacing: 4
+            spacing: 6
 
             Label {
-                text: "ISenseCloud (ISC)"
-                font.pixelSize: Theme.fontLg
+                text: "ISenseCloud"
+                font.pixelSize: Theme.fontXl
+                font.bold: true
                 color: Theme.headingColor
             }
 
             Label {
                 text: "Version " + appVersion
-                font.pixelSize: Theme.fontSm
+                font.pixelSize: Theme.fontMd
                 color: Theme.bodyColor
             }
-
-            Label {
-                text: "Temperature-sensing wafer monitoring"
-                font.pixelSize: Theme.fontSm
-                color: Theme.bodyColor
-                wrapMode: Text.WordWrap
-                Layout.fillWidth: true
-            }
         }
 
         // ── Separator ──
@@ -78,7 +71,7 @@ Popup {
         Rectangle {
             Layout.fillWidth: true
             Layout.fillHeight: true
-            Layout.minimumHeight: 120
+            Layout.minimumHeight: 150
             radius: Theme.radiusSm
             color: Theme.panelBackground
             border.color: Theme.cardBorder
@@ -86,8 +79,8 @@ Popup {
 
             ColumnLayout {
                 anchors.fill: parent
-                anchors.margins: 10
-                spacing: 2
+                anchors.margins: 14
+                spacing: 6
 
                 RowLayout {
                     Layout.fillWidth: true
@@ -95,7 +88,8 @@ Popup {
                     Label {
                         text: "LICENSE"
                         color: Theme.panelTitleText
-                        font.pixelSize: Theme.fontXs
+                        font.pixelSize: Theme.fontSm
+                        font.bold: true
                         font.letterSpacing: 0.5
                         Layout.fillWidth: true
                     }
@@ -105,18 +99,18 @@ Popup {
                         visible: false
                         text: "Invalid license file"
                         color: Theme.statusWarningColor
-                        font.pixelSize: Theme.fontXs
+                        font.pixelSize: Theme.fontSm
                     }
                 }
 
                 // Grid header
                 RowLayout {
                     Layout.fillWidth: true
-                    spacing: 4
-                    Label { text: "Wafer SN"; font.pixelSize: Theme.fontXs; font.bold: true; color: Theme.subheadingColor; Layout.preferredWidth: 100 }
-                    Label { text: "Mfg Date"; font.pixelSize: Theme.fontXs; font.bold: true; color: Theme.subheadingColor; Layout.preferredWidth: 90 }
-                    Label { text: "Level"; font.pixelSize: Theme.fontXs; font.bold: true; color: Theme.subheadingColor; Layout.preferredWidth: 50 }
-                    Label { text: "License Date"; font.pixelSize: Theme.fontXs; font.bold: true; color: Theme.subheadingColor; Layout.fillWidth: true }
+                    spacing: 8
+                    Label { text: "Wafer SN"; font.pixelSize: Theme.fontSm; font.bold: true; color: Theme.subheadingColor; Layout.preferredWidth: 150 }
+                    Label { text: "Mfg Date"; font.pixelSize: Theme.fontSm; font.bold: true; color: Theme.subheadingColor; Layout.preferredWidth: 120 }
+                    Label { text: "Level"; font.pixelSize: Theme.fontSm; font.bold: true; color: Theme.subheadingColor; Layout.preferredWidth: 80 }
+                    Label { text: "License Date"; font.pixelSize: Theme.fontSm; font.bold: true; color: Theme.subheadingColor; Layout.fillWidth: true }
                 }
 
                 Rectangle {
@@ -133,11 +127,11 @@ Popup {
                     model: licenseModel.licenses
                     delegate: RowLayout {
                         width: ListView.view.width
-                        spacing: 4
-                        Label { text: modelData.serial; font.pixelSize: Theme.fontSm; color: Theme.bodyColor; Layout.preferredWidth: 100 }
-                        Label { text: modelData.mfgDate; font.pixelSize: Theme.fontSm; color: Theme.bodyColor; Layout.preferredWidth: 90 }
-                        Label { text: modelData.level; font.pixelSize: Theme.fontSm; color: Theme.bodyColor; Layout.preferredWidth: 50 }
-                        Label { text: modelData.licDate; font.pixelSize: Theme.fontSm; color: Theme.bodyColor; Layout.fillWidth: true }
+                        spacing: 8
+                        Label { text: modelData.serial; font.pixelSize: Theme.fontMd; color: Theme.bodyColor; Layout.preferredWidth: 150 }
+                        Label { text: modelData.mfgDate; font.pixelSize: Theme.fontMd; color: Theme.bodyColor; Layout.preferredWidth: 120 }
+                        Label { text: modelData.level; font.pixelSize: Theme.fontMd; color: Theme.bodyColor; Layout.preferredWidth: 80 }
+                        Label { text: modelData.licDate; font.pixelSize: Theme.fontMd; color: Theme.bodyColor; Layout.fillWidth: true }
                     }
                 }
 
@@ -145,7 +139,7 @@ Popup {
                     visible: licenseModel.licenses.length === 0
                     text: "No license loaded"
                     color: Theme.bodyColor
-                    font.pixelSize: Theme.fontSm
+                    font.pixelSize: Theme.fontMd
                     Layout.fillWidth: true
                     Layout.fillHeight: true
                     verticalAlignment: Text.AlignVCenter
@@ -157,11 +151,12 @@ Popup {
         // ── Buttons ──
         RowLayout {
             Layout.fillWidth: true
+            spacing: 12
 
             Button {
                 text: "Load License"
-                Layout.preferredWidth: 120
-                Layout.preferredHeight: 32
+                Layout.preferredWidth: 140
+                Layout.preferredHeight: 36
                 onClicked: licenseFileDialog.open()
 
                 background: Rectangle {
@@ -173,6 +168,8 @@ Popup {
                 contentItem: Label {
                     text: parent.text
                     color: Theme.buttonNeutralText
+                    font.pixelSize: Theme.fontMd
+                    font.bold: true
                     horizontalAlignment: Text.AlignHCenter
                     verticalAlignment: Text.AlignVCenter
                 }
@@ -183,7 +180,7 @@ Popup {
             Button {
                 text: "Close"
                 Layout.preferredWidth: 100
-                Layout.preferredHeight: 32
+                Layout.preferredHeight: 36
                 onClicked: root.close()
 
                 background: Rectangle {
@@ -195,6 +192,8 @@ Popup {
                 contentItem: Label {
                     text: parent.text
                     color: Theme.buttonNeutralText
+                    font.pixelSize: Theme.fontMd
+                    font.bold: true
                     horizontalAlignment: Text.AlignHCenter
                     verticalAlignment: Text.AlignVCenter
                 }

src/pygui/ISC/HomePage.qml

@@ -23,9 +23,14 @@ Rectangle {
         if (selectedTabIndex === 2) {
             file_browser.refreshFiles();
             streamController.unloadFile()
+        } else if (streamController.mode === "live") {
+            // Leaving the map tab mid-stream: stop and blank the live map.
+            streamController.setMode("review")
         }
     }
 
+
+
     property bool memoryRead: false
     property bool waferDetected: false
     // TODO P2.2: add `property bool waferLicensed: false`; set it in
@@ -86,7 +91,9 @@ Rectangle {
         id: saveDirDialog
         title: "Choose a folder to save Data"
         onAccepted: {
-            deviceController.setSaveDataDir(root.cleanFolderUrl(selectedFolder))
+            var dir = root.cleanFolderUrl(selectedFolder)
+            deviceController.setSaveDataDir(dir)
+            file_browser.setCurrentDirectory(dir)
             root._doDetect()
         }
     }
@@ -213,9 +220,30 @@ Rectangle {
 
                     ListModel {
                         id: pillModel
-                        ListElement { label: "STATUS"; icon: "Tabs/icons/status.svg"; expandW: 86 }
-                        ListElement { label: "DATA";   icon: "Tabs/icons/data.svg";   expandW: 66 }
-                        ListElement { label: "MAP";    icon: "Tabs/icons/map.svg";    expandW: 58 }
+                        ListElement {
+                            label: "STATUS"
+                            icon: "Tabs/icons/status.svg"
+                            expandW: 86
+                            desc: "Monitor real-time device connection, serial communication, and execute wafer actions."
+                        }
+                        ListElement {
+                            label: "DATA"
+                            icon: "Tabs/icons/data.svg"
+                            expandW: 66
+                            desc: "Manage, review, compare (DTW), and split historical sensor data records."
+                        }
+                        ListElement {
+                            label: "MAP"
+                            icon: "Tabs/icons/map.svg"
+                            expandW: 58
+                            desc: "Visualize spatial sensor readings on a 2D thin-plate spline RBF interpolated heatmap."
+                        }
+                        ListElement {
+                            label: "GRAPH"
+                            icon: "Tabs/icons/bar-chart.svg"
+                            expandW: 70
+                            desc: "Whole-run multi-sensor temperature chart for the currently loaded file."
+                        }
                     }
 
                     RowLayout {
@@ -227,15 +255,6 @@ Rectangle {
                             model: pillModel
                             delegate: Button {
                                 id: pillBtn
-                                // TODO P3.1: lock MAP pill (index 2) when no license:
-                                //   `enabled: index !== 2 || licenseModel.licenses.length > 0`
-                                //   and dim icon/label when disabled. licensesChanged
-                                //   notify already fires on Load License → unlocks live,
-                                //   no restart. Rule is "any valid license" (not
-                                //   per-wafer): Map also replays CSVs with no wafer
-                                //   attached. Also gate the Map Loader (see TODO at the
-                                //   StackLayout below) and the auto-switch at
-                                //   onParsedDataReady. See plan §3.1.
                                 checked: root.selectedTabIndex === index
                                 flat: true
                                 Layout.fillWidth: true
@@ -305,6 +324,11 @@ Rectangle {
                                     }
                                 }
 
+                                AppToolTip {
+                                    visible: pillBtn.hovered
+                                    text: "<b>" + model.label + "</b>: " + model.desc
+                                }
+
                                 onClicked: root.selectedTabIndex = index
                             }
                         }
@@ -598,6 +622,8 @@ Rectangle {
                 UtilityFooter {
                     id: utilFooter
                     Layout.fillWidth: true
+                    settingsPopup: settingsPopup
+                    aboutDialog: aboutDialog
                 }
             }
         }
@@ -628,6 +654,10 @@ Rectangle {
                     //   so the tab never instantiates while locked. See plan §3.1.
                     active: StackLayout.index === root.selectedTabIndex
                 }
+                Loader {
+                    source: "Tabs/GraphTab.qml"
+                    active: StackLayout.index === root.selectedTabIndex
+                }
             }
         }
     }

src/pygui/ISC/Tabs/DataTab.qml

@@ -57,7 +57,7 @@ Item {
         if (root.runAWaferType === "" || root.runBWaferType === "")
             return "Recording has no wafer family — register it as a master file (Settings → Master Files)"
         if (root.runAWaferType !== root.runBWaferType)
-            return "Wafer family mismatch: " + root.runAWaferType + " vs " + root.runBWaferType
+            return "Wafer Family Mismatch: " + root.runAWaferType + " vs " + root.runBWaferType
         return ""
     }
     property real warpingDistance: -1
@@ -292,9 +292,9 @@ Item {
             ComparisonSidePanel {
                 id: sidePanel
                 Layout.fillWidth: false                
-                Layout.preferredWidth: 280
-                Layout.minimumWidth: 280
-                Layout.maximumWidth: 280
+                Layout.preferredWidth: Theme.rightRailWidth
+                Layout.minimumWidth: Theme.rightRailWidth
+                Layout.maximumWidth: Theme.rightRailWidth
                 Layout.fillHeight: true
                 warpingDistance: root.warpingDistance
                 frameOffset: root.frameOffset

src/pygui/ISC/Tabs/GraphTab.qml

@@ -0,0 +1,49 @@
+import QtQuick
+import QtQuick.Layouts
+import ISC
+import ISC.Tabs.components
+
+// ===== Graph Tab =====
+// Whole-run multi-sensor line chart (C# parity: tabGraph/chartData). Static
+// snapshot recomputed whenever a file is loaded — not live-updating during
+// a stream. RunChart adds wheel zoom, drag pan, and a visible-range
+// min/max/avg strip. See specs/plans/2026-07-10-graph-tab.md and
+// docs/adr/0003-pyqtgraph-for-multi-sensor-charts.md.
+Item {
+    id: root
+    anchors.fill: parent
+
+    function refresh() {
+        if (!streamController.loadedFile) {
+            chart.seriesData = []
+            chart.sensorNames = []
+            return
+        }
+        chart.sensorNames = streamController.graphSensorNames
+            ? streamController.graphSensorNames.split(",") : []
+        chart.seriesData = JSON.parse(streamController.graphSeriesJson || "[]")
+    }
+
+    Connections {
+        target: streamController
+        function onLoadedFileChanged() { root.refresh() }
+    }
+
+    Component.onCompleted: root.refresh()
+
+    Rectangle {
+        anchors.fill: parent
+        anchors.margins: Theme.panelPadding
+        color: Theme.cardBackground
+        border.color: Theme.cardBorder
+        border.width: 1
+        radius: Theme.radiusMd
+
+        RunChart {
+            id: chart
+            anchors.fill: parent
+            anchors.margins: 8
+            title: "Sensor Temperature Over Time"
+        }
+    }
+}

src/pygui/ISC/Tabs/StatusTab.qml

@@ -122,7 +122,9 @@ ColumnLayout {
         id: saveDirDialog
         title: "Choose a folder to save."
         onAccepted: {
-            deviceController.setSaveDataDir(root.cleanFolderUrl(selectedFolder));
+            var dir = root.cleanFolderUrl(selectedFolder);
+            deviceController.setSaveDataDir(dir);
+            file_browser.setCurrentDirectory(dir);
             root.parseAndSavePendingRead();
         }
     }
@@ -132,7 +134,11 @@ ColumnLayout {
     FolderDialog {
         id: dirOnlyDialog
         title: "Choose a folder to save Data"
-        onAccepted: deviceController.setSaveDataDir(root.cleanFolderUrl(selectedFolder))
+        onAccepted: {
+            var dir = root.cleanFolderUrl(selectedFolder);
+            deviceController.setSaveDataDir(dir);
+            file_browser.setCurrentDirectory(dir);
+        }
     }
 
     // Post-read metadata editor (C# parity: EditCSVMetadataDialog after read).

src/pygui/ISC/Tabs/WaferMapTab.qml

@@ -1,7 +1,6 @@
 import QtQuick
 import QtQuick.Controls
 import QtQuick.Controls.impl
-import QtQuick.Dialogs
 import QtQuick.Layouts
 import ISC
 import ISC.Tabs.components
@@ -11,39 +10,23 @@ Item {
     id: root
     anchors.fill: parent
 
-    // Live elapsed-time counter
-    property int _liveSecs: 0
-    Timer {
-        id: liveTimer
-        interval: 1000
-        repeat: true
-        running: streamController.mode === "live" && streamController.state !== "idle"
-        onTriggered: root._liveSecs++
-        onRunningChanged: if (!running)
-            root._liveSecs = 0
-    }
-    function fmtTime(s) {
-        var m = Math.floor(s / 60);
-        var ss = s % 60;
-        return (m < 10 ? "0" : "") + m + ":" + (ss < 10 ? "0" : "") + ss;
-    }
-    // Wire streamController.trendData (Signal(str) carrying JSON list of floats)
-    // into the trend chart's data property. The slot parseJsonToData() is defined
-    // on the Python TrendChartItem; we use it so malformed payloads are logged
-    // there instead of crashing the QML binding.
+    // Wire streamController.trendDelta (Signal(str) carrying one new
+    // [elapsed_s, value] pair per live frame) into the trend chart, which
+    // accumulates its own bounded 60s window. trendReset clears it when a
+    // new stream starts. Parsing happens on the Python TrendChartItem side
+    // so malformed payloads are logged there instead of crashing the QML
+    // binding.
     property string loadErrorMessage: ""
     Connections {
         target: streamController
-        function onTrendData(avgsJson) {
-            trendChart.setDataFromJson(avgsJson);
+        function onTrendDelta(deltaJson) {
+            trendChart.appendDelta(deltaJson);
+        }
+        function onTrendReset() {
+            trendChart.clearTrend();
         }
-        // A file was picked from the rail (any tab) — loadFile() switches the
-        // backend to review mode; mirror that in the toolbar toggle so a
-        // successful load is never hidden behind a stale "Live" selection.
         function onLoadedFileChanged() {
             root.loadErrorMessage = "";
-            if (streamController.mode === "review")
-                modeBar.currentIndex = 0;
         }
         function onLoadFileError(message) {
             root.loadErrorMessage = message;
@@ -60,107 +43,6 @@ Item {
             Layout.fillWidth: true
             spacing: 10
 
-            // Mode toggle
-            TabBar {
-                id: modeBar
-                currentIndex: 0  // Default to "Review"
-                spacing: 2
-                padding: 2
-                background: Rectangle {
-                    color: Theme.subtleSectionBackground
-                    radius: Theme.radiusSm
-                    border.color: Theme.cardBorder
-                    border.width: Theme.borderThin
-                }
-                TabButton {
-                    text: "Review"
-                    implicitWidth: 84
-                    implicitHeight: 34
-                    background: Rectangle {
-                        color: parent.checked ? Theme.tabActiveBackground : "transparent"
-                        radius: Theme.radiusSm - 1
-                    }
-                    contentItem: Text {
-                        text: parent.text
-                        color: parent.checked ? Theme.headingColor : Theme.bodyColor
-                        font.pixelSize: Theme.fontMd
-                        font.weight: parent.checked ? Font.Medium : Font.Normal
-                        horizontalAlignment: Text.AlignHCenter
-                        verticalAlignment: Text.AlignVCenter
-                    }
-                }
-                TabButton {
-                    id: liveTab
-                    text: "Live"
-                    enabled: deviceController.connectionStatus === "Connected"
-                    opacity: enabled ? 1.0 : 0.4
-                    implicitWidth: 84
-                    implicitHeight: 34
-                    // Disabled controls swallow no events at all, so hover for the
-                    // "why is this greyed out" tooltip needs its own MouseArea.
-                    AppToolTip {
-                        visible: disabledHover.containsMouse && !liveTab.enabled
-                        text: "Connect a wafer to enable Live mode"
-                        delay: 300
-                    }
-                    MouseArea {
-                        id: disabledHover
-                        anchors.fill: parent
-                        enabled: !liveTab.enabled
-                        hoverEnabled: true
-                        acceptedButtons: Qt.NoButton
-                    }
-                    background: Rectangle {
-                        color: parent.checked ? Theme.tabActiveBackground : "transparent"
-                        radius: Theme.radiusSm - 1
-                    }
-                    contentItem: Row {
-                        spacing: 5
-                        leftPadding: 8
-                        Rectangle {
-                            id: liveTabDot
-                            width: 7; height: 7; radius: 3.5
-                            anchors.verticalCenter: parent.verticalCenter
-                            color: liveTab.enabled ? Theme.metricGood : Theme.sideMutedText
-
-                            // Flash while actually streaming live
-                            SequentialAnimation on opacity {
-                                running: streamController.mode === "live" && streamController.state !== "idle"
-                                loops: Animation.Infinite
-                                NumberAnimation { to: 0.2; duration: 600; easing.type: Easing.InOutQuad }
-                                NumberAnimation { to: 1.0; duration: 600; easing.type: Easing.InOutQuad }
-                                onRunningChanged: if (!running) liveTabDot.opacity = 1.0
-                            }
-                        }
-                        Text {
-                            text: liveTab.text
-                            color: liveTab.checked ? Theme.headingColor : Theme.bodyColor
-                            font.pixelSize: Theme.fontMd
-                            font.weight: liveTab.checked ? Font.Medium : Font.Normal
-                            verticalAlignment: Text.AlignVCenter
-                            height: parent.height
-                        }
-                    }
-                }
-                onCurrentIndexChanged: if (currentIndex === 1) {
-                    // Guard: revert to Review if not connected
-                    if (deviceController.connectionStatus !== "Connected") {
-                        currentIndex = 0;
-                        return;
-                    }
-                    // Entering Live mode
-                    streamController.setMode("live");
-                    var fc = "";
-                    if (deviceController.lastWaferInfo && deviceController.lastWaferInfo.length > 0) {
-                        fc = deviceController.lastWaferInfo[0];
-                    }
-                    streamController.startStream(deviceController.selectedPort, fc);
-                } else {
-                    // Entering Review Mode (automatically calls stopStream in backend)
-                    streamController.setMode("review");
-                }
-            }
-
             Item {
                 Layout.fillWidth: true
             }
@@ -215,49 +97,6 @@ Item {
                     font.letterSpacing: 1.2
                 }
             }
-            
-            // Record start/stop toggle (Live mode)
-            Button {
-                visible: streamController.mode === "live"
-                enabled: streamController.state !== "idle" || streamController.recording
-                text: streamController.recording ? "Stop REC" : "Record"
-                onClicked: {
-                    if (streamController.recording) {
-                        streamController.stopRecording();
-                    } else {
-                        var info = deviceController.lastWaferInfo;
-                        var serial = (info && info.length > 1) ? info[1] : "";
-                        var ts = Qt.formatDateTime(new Date(), "yyyyMMdd_HHmmss");
-                        var name = "live_" + (serial ? serial + "_" : "") + ts + ".csv";
-                        streamController.startRecording(deviceController.saveDataDir + "/" + name, serial);
-                    }
-                }
-            }
-
-            // Stream statistics popup (Live mode)
-            Button {
-                visible: streamController.mode === "live"
-                text: "Stats"
-                onClicked: streamStatsDialog.open()
-            }
-
-            StreamStatsDialog {
-                id: streamStatsDialog
-                elapsedSecs: root._liveSecs
-            }
-
-            Button {
-                text: "Export PNG"
-                onClicked: exportDialog.open()
-            }
-
-            FileDialog {
-                id: exportDialog
-                title: "Export Wafer Map"
-                fileMode: FileDialog.SaveFile
-                nameFilters: ["PNG files (*.png)"]
-                onAccepted: waferView.exportImage(String(selectedFile).replace(/^file:\/\//, ""))
-            }
         }
 
         // ── Load error banner ───────────────────────────────────────────
@@ -305,55 +144,78 @@ Item {
             ColumnLayout {
                 Layout.fillWidth: true
                 Layout.fillHeight: true
-                spacing: 8
+                spacing: 16
 
                 WaferMapView {
                     id: waferView
                     Layout.fillWidth: true
                     Layout.fillHeight: true
+                    Layout.preferredHeight: 400
+                    Layout.minimumHeight: 280
                     blend: readoutPanel.heatmapBlend
                     showLabels: readoutPanel.showLabels
+                    showExtremes: readoutPanel.showExtremes
                     showThickness: readoutPanel.showThickness
                 }
                 Rectangle {
                     id: trendPane
                     Layout.fillWidth: true
-                    implicitHeight: 160
+                    Layout.fillHeight: false
+                    Layout.preferredHeight: 220
+                    Layout.minimumHeight: 120
                     visible: trendChart.hasData && streamController.mode === "live"
                     color: Theme.cardBackground
                     border.color: Theme.cardBorder
                     border.width: 1
                     radius: Theme.radiusMd
 
-                    TrendChartItem {
-                        id: trendChart
+                    ColumnLayout {
                         anchors.fill: parent
                         anchors.margins: 8
+                        spacing: 10
+
+                        TrendChartItem {
+                            id: trendChart
+                            Layout.fillWidth: true
+                            Layout.fillHeight: true
+                        }
                     }
                 }
 
                 Item {
                     Layout.fillWidth: true
-                    implicitHeight: 16
+                    visible: transportBar.hasContent
+                    implicitHeight: trendPane.visible ? 52 : 16
                 }
                 TransportBar {
+                    id: transportBar
                     Layout.fillWidth: true
                 }
             }
 
-            // Readout panel — floating wrapper box
-            Rectangle {
-                Layout.preferredWidth: 220
+            // Readout panel — scrolls instead of clipping so the last card
+            // (Thresholds) is always reachable even if content outgrows
+            // the available height (e.g. once E-C delta rows appear).
+            ScrollView {
+                Layout.preferredWidth: Theme.rightRailWidth
                 Layout.fillHeight: true
-                color: "transparent"
-                border.color: "transparent"
-                border.width: 0
                 clip: true
+                ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
 
                 ReadoutPanel {
                     id: readoutPanel
-                    anchors.fill: parent
-                    anchors.margins: 0
+                    width: parent.width
+                    hasThicknessData: waferView.hasThickness
+                    onExportRequested: function(filePath, extra) {
+                        waferView.exportImage(filePath, extra);
+                    }
+                    onThicknessFileChosen: function(filePath) {
+                        var err = waferView.loadThickness(filePath);
+                        if (err !== "") {
+                            root.loadErrorMessage = err;
+                            readoutPanel.showThickness = false;
+                        }
+                    }
                 }
             }
         }

src/pygui/ISC/Tabs/components/MetricRow.qml

@@ -0,0 +1,28 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import ISC
+
+RowLayout {
+    property string label
+    property string value
+    property color valueColor: Theme.headingColor
+    Layout.fillWidth: true
+    spacing: 4
+
+    Label {
+        text: label
+        color: Theme.sideMutedText
+        font.family: Theme.uiFontFamily
+        font.pixelSize: Theme.fontMd
+        font.bold: true
+        Layout.fillWidth: true
+    }
+    Label {
+        text: value
+        color: valueColor
+        font.family: Theme.codeFontFamily
+        font.pixelSize: Theme.fontMd
+        font.bold: true
+    }
+}

src/pygui/ISC/Tabs/components/RailActionButton.qml

@@ -12,6 +12,9 @@ Rectangle {
     property string label: ""
     property string iconSource: ""
     property bool destructive: false
+    // Set true to show the button as "active" (e.g. a one-shot toggle
+    // that's mid-operation), independent of hover/press state.
+    property bool toggled: false
     property color _textColor: !root.enabled ? Theme.sideMutedText
         : root.destructive ? Theme.statusErrorColor
         : Theme.headingColor
@@ -20,7 +23,7 @@ Rectangle {
 
     implicitHeight: Theme.sideButtonHeight
     radius: 8
-    color: mouseArea.containsMouse || mouseArea.pressed
+    color: root.toggled || mouseArea.containsMouse || mouseArea.pressed
         ? Theme.sideActiveBackground : "transparent"
     border.width: 0
 

src/pygui/ISC/Tabs/components/ReadoutPanel.qml

@@ -1,61 +1,26 @@
 import QtQuick
 import QtQuick.Controls
-import QtQuick.Controls.impl
+import QtQuick.Dialogs
 import QtQuick.Layouts
 import ISC
 
 // ===== Readout Panel =====
-// Right-rail panel with three bordered sections: READOUT, DISPLAY, THRESHOLDS.
-// Cards match the left-rail SOURCE / CONNECTION FLOW style.
+// Right-rail panel with three bento-tile sections: READOUT, DISPLAY,
+// THRESHOLDS. Uses the same PanelBox / SectionTitle / ReadoutStat /
+// PanelCheckBox / PanelSlider components as the Data tab's
+// ComparisonSidePanel, so both right rails share one visual language.
 ColumnLayout {
+    id: root
     spacing: 6
     property var s: streamController.stats
     property alias showLabels: labelsToggle.checked
+    property alias showExtremes: extremesToggle.checked
     property alias heatmapBlend: heatmapSlider.value
     property alias showThickness: thicknessToggle.checked
+    property bool hasThicknessData: false
 
-    component PanelCheckBox: CheckBox {
-        id: toggle
-        indicator: Rectangle {
-            implicitWidth: 18
-            implicitHeight: 18
-            x: toggle.leftPadding
-            y: parent.height / 2 - height / 2
-            radius: Theme.radiusXs
-            color: toggle.checked ? Theme.primaryAccent : "transparent"
-            border.width: Theme.borderThin
-            border.color: toggle.checked ? Theme.primaryAccent : Theme.fieldBorder
-
-            Behavior on color {
-                ColorAnimation { duration: Theme.durationFast }
-            }
-            Behavior on border.color {
-                ColorAnimation { duration: Theme.durationFast }
-            }
-
-            IconImage {
-                anchors.centerIn: parent
-                source: "../icons/check.svg"
-                width: 12; height: 12
-                sourceSize.width: 12
-                sourceSize.height: 12
-                color: Theme.panelBackground
-                opacity: toggle.checked ? 1.0 : 0.0
-                Behavior on opacity {
-                    NumberAnimation { duration: Theme.durationFast }
-                }
-            }
-        }
-
-        contentItem: Text {
-            text: toggle.text
-            color: Theme.headingColor
-            font.family: Theme.uiFontFamily
-            verticalAlignment: Text.AlignVCenter
-            leftPadding: toggle.indicator.width + toggle.spacing
-            font.pixelSize: toggle.font.pixelSize || Theme.fontXs
-        }
-    }
+    signal exportRequested(string filePath, string extra)
+    signal thicknessFileChosen(string filePath)
 
     component BadgePill: Rectangle {
         implicitWidth: badgeLabel.implicitWidth + 10
@@ -75,374 +40,106 @@ ColumnLayout {
         }
     }
 
-    // Live-mode stream stats + stop — moved here from the footer transport bar
-    // so that bar collapses to zero height in live mode, freeing vertical
-    // space for the trend chart.
-    Rectangle {
+    StreamControlPanel {
         Layout.fillWidth: true
-        visible: streamController.mode === "live"
-        implicitHeight: visible ? liveStatsCard.implicitHeight + 24 : 0
-        color: Theme.sidePanelBackground
-        radius: Theme.sidePanelRadius
-        border.color: Theme.sideBorder
-        border.width: 1
+        onExportRequested: function(filePath, extra) {
+            root.exportRequested(filePath, extra);
+        }
+    }
+
+    // ── READOUT ─────────────────────────────────────────────────────
+    PanelBox {
+        Layout.fillWidth: true
+        Layout.preferredHeight: readoutCol.implicitHeight + 24
 
         ColumnLayout {
-            id: liveStatsCard
-            anchors {
-                left: parent.left
-                right: parent.right
-                top: parent.top
-                margins: 12
-            }
+            id: readoutCol
+            anchors.fill: parent
+            anchors.margins: 12
             spacing: 8
 
-            Label {
-                text: "LIVE STREAM"
-                color: Theme.sideMutedText
-                font.family: Theme.uiFontFamily
-                font.pixelSize: Theme.fontSm
-                font.letterSpacing: 1.5
-                font.bold: true
-                Layout.bottomMargin: 4
+            SectionTitle { text: "READOUT" }
+
+            ReadoutStat {
+                label: "Min Temp"
+                value: s.min !== undefined
+                    ? s.min + ((s.minIndex !== undefined && s.minIndex >= 0) ? "  #" + s.minIndex : "")
+                    : "—"
+                valueColor: Theme.sensorLow
             }
-
-            RowLayout {
-                Layout.fillWidth: true
-                Label {
-                    text: "Received"
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontSm
-                    font.bold: true
-                }
-                Item { Layout.fillWidth: true }
-                Label {
-                    text: streamController.receivedCount
-                    color: Theme.headingColor
-                    font.family: Theme.codeFontFamily
-                    font.pixelSize: Theme.fontLg
-                    font.bold: true
-                }
+            ReadoutStat {
+                label: "Max Temp"
+                value: s.max !== undefined
+                    ? s.max + ((s.maxIndex !== undefined && s.maxIndex >= 0) ? "  #" + s.maxIndex : "")
+                    : "—"
+                valueColor: Theme.sensorHigh
             }
-
-            Rectangle {
-                Layout.fillWidth: true
-                height: 1
-                color: Theme.cardBorder
+            ReadoutStat {
+                label: "Diff"
+                value: s.diff !== undefined ? s.diff : "—"
+                valueColor: Theme.diffAccent
             }
-
-            RowLayout {
-                Layout.fillWidth: true
-                Label {
-                    text: "Errors"
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontSm
-                    font.bold: true
-                }
-                Item { Layout.fillWidth: true }
-                Label {
-                    text: streamController.errorCount
-                    color: streamController.errorCount > 0 ? Theme.statusWarningColor : Theme.headingColor
-                    font.family: Theme.codeFontFamily
-                    font.pixelSize: Theme.fontLg
-                    font.bold: true
-                }
+            ReadoutStat {
+                label: "Average"
+                value: s.avg !== undefined ? s.avg : "—"
             }
-
-            Button {
-                id: stopStreamBtn
-                Layout.fillWidth: true
-                Layout.topMargin: 4
-                hoverEnabled: true
-                text: "STOP"
-                font.family: Theme.uiFontFamily
-                font.pixelSize: Theme.fontSm
-                font.weight: Font.Medium
-                font.letterSpacing: 1.0
-
-                background: Rectangle {
-                    radius: 8
-                    color: stopStreamBtn.down ? Theme.transportButtonHover
-                         : (stopStreamBtn.hovered ? Theme.transportButtonBg : "transparent")
-                    border.width: Theme.borderThin
-                    border.color: Theme.sideBorder
-                    Behavior on color {
-                        ColorAnimation { duration: Theme.durationFast }
-                    }
-                }
-                contentItem: Text {
-                    text: stopStreamBtn.text
-                    color: Theme.headingColor
-                    font: stopStreamBtn.font
-                    horizontalAlignment: Text.AlignHCenter
-                    verticalAlignment: Text.AlignVCenter
-                }
-                onClicked: streamController.stopStream()
+            ReadoutStat {
+                label: "Sigma (Σ)"
+                value: s.sigma !== undefined ? s.sigma : "—"
+            }
+            ReadoutStat {
+                label: "3Σ Value"
+                value: s.threeSigma !== undefined ? s.threeSigma : "—"
+            }
+            ReadoutStat {
+                visible: s.ecMinDelta !== undefined
+                label: "E-C Δ Min"
+                value: s.ecMinDelta !== undefined
+                    ? s.ecMinDelta.toFixed(2) + " (#" + s.ecMinEdgeIndex + "→#" + s.ecMinCenterIndex + ")"
+                    : "—"
+            }
+            ReadoutStat {
+                visible: s.ecMaxDelta !== undefined
+                label: "E-C Δ Max"
+                value: s.ecMaxDelta !== undefined
+                    ? s.ecMaxDelta.toFixed(2) + " (#" + s.ecMaxEdgeIndex + "→#" + s.ecMaxCenterIndex + ")"
+                    : "—"
             }
         }
     }
 
-    Rectangle {
+    // ── DISPLAY ─────────────────────────────────────────────────────
+    PanelBox {
         Layout.fillWidth: true
-        implicitHeight: readoutCard.implicitHeight + 24
-        color: Theme.sidePanelBackground
-        radius: Theme.sidePanelRadius
-        border.color: Theme.sideBorder
-        border.width: 1
-
-        ColumnLayout {
-            id: readoutCard
-            anchors {
-                left: parent.left
-                right: parent.right
-                top: parent.top
-                topMargin: 12
-            }
-            spacing: 0
-
-            // Header Inside the Box
-            Label {
-                text: "READOUT"
-                color: Theme.sideMutedText
-                font.family: Theme.uiFontFamily
-                font.pixelSize: Theme.fontSm
-                font.letterSpacing: 1.5
-                font.bold: true
-                Layout.leftMargin: 14
-                Layout.rightMargin: 14
-                Layout.topMargin: 2
-                Layout.bottomMargin: 10
-            }
-
-            // Min Temp Row
-            RowLayout {
-                Layout.fillWidth: true
-                Layout.leftMargin: 14
-                Layout.rightMargin: 14
-                Layout.preferredHeight: 32
-                Label {
-                    text: "MIN TEMP"
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontSm
-                    font.bold: true
-                }
-                Item { Layout.fillWidth: true }
-                RowLayout {
-                    spacing: 4
-                    Label {
-                        text: s.min !== undefined ? s.min : "—"
-                        color: Theme.sensorLow
-                        font.family: Theme.codeFontFamily
-                        font.pixelSize: Theme.fontLg
-                        font.bold: true
-                    }
-                    Label {
-                        visible: (s.minIndex !== undefined) && s.minIndex >= 0
-                        text: "#" + (s.minIndex !== undefined ? s.minIndex : "")
-                        color: Theme.sideMutedText
-                        font.family: Theme.uiFontFamily
-                        font.pixelSize: Theme.font2xs
-                        Layout.alignment: Qt.AlignBottom
-                        bottomPadding: 3
-                    }
-                }
-            }
-
-            Rectangle {
-                Layout.fillWidth: true
-                height: 1
-                color: Theme.cardBorder
-            }
-
-            // Max Temp Row
-            RowLayout {
-                Layout.fillWidth: true
-                Layout.leftMargin: 14
-                Layout.rightMargin: 14
-                Layout.preferredHeight: 32
-                Label {
-                    text: "MAX TEMP"
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontSm
-                    font.bold: true
-                }
-                Item { Layout.fillWidth: true }
-                RowLayout {
-                    spacing: 4
-                    Label {
-                        text: s.max !== undefined ? s.max : "—"
-                        color: Theme.sensorHigh
-                        font.family: Theme.codeFontFamily
-                        font.pixelSize: Theme.fontLg
-                        font.bold: true
-                    }
-                    Label {
-                        visible: (s.maxIndex !== undefined) && s.maxIndex >= 0
-                        text: "#" + (s.maxIndex !== undefined ? s.maxIndex : "")
-                        color: Theme.sideMutedText
-                        font.family: Theme.uiFontFamily
-                        font.pixelSize: Theme.font2xs
-                        Layout.alignment: Qt.AlignBottom
-                        bottomPadding: 3
-                    }
-                }
-            }
-
-            Rectangle {
-                Layout.fillWidth: true
-                height: 1
-                color: Theme.cardBorder
-            }
-
-            // Differential Row
-            RowLayout {
-                Layout.fillWidth: true
-                Layout.leftMargin: 14
-                Layout.rightMargin: 14
-                Layout.preferredHeight: 32
-                Label {
-                    text: "DIFF"
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontSm
-                    font.bold: true
-                }
-                Item { Layout.fillWidth: true }
-                Label {
-                    text: s.diff !== undefined ? s.diff : "—"
-                    color: Theme.diffAccent
-                    font.family: Theme.codeFontFamily
-                    font.pixelSize: Theme.fontLg
-                    font.bold: true
-                }
-            }
-
-            Rectangle {
-                Layout.fillWidth: true
-                height: 1
-                color: Theme.cardBorder
-            }
-
-            // Average Row
-            RowLayout {
-                Layout.fillWidth: true
-                Layout.leftMargin: 14
-                Layout.rightMargin: 14
-                Layout.preferredHeight: 32
-                Label {
-                    text: "AVERAGE"
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontSm
-                    font.bold: true
-                }
-                Item { Layout.fillWidth: true }
-                Label {
-                    text: s.avg !== undefined ? s.avg : "—"
-                    color: Theme.headingColor
-                    font.family: Theme.codeFontFamily
-                    font.pixelSize: Theme.fontLg
-                    font.bold: true
-                }
-            }
-
-            Rectangle {
-                Layout.fillWidth: true
-                height: 1
-                color: Theme.cardBorder
-            }
-
-            // Sigma Row
-            RowLayout {
-                Layout.fillWidth: true
-                Layout.leftMargin: 14
-                Layout.rightMargin: 14
-                Layout.preferredHeight: 32
-                Label {
-                    text: "SIGMA (Σ)"
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontSm
-                    font.bold: true
-                }
-                Item { Layout.fillWidth: true }
-                Label {
-                    text: s.sigma !== undefined ? s.sigma : "—"
-                    color: Theme.headingColor
-                    font.family: Theme.codeFontFamily
-                    font.pixelSize: Theme.fontLg
-                    font.bold: true
-                }
-            }
-
-            Rectangle {
-                Layout.fillWidth: true
-                height: 1
-                color: Theme.cardBorder
-            }
-
-            // 3-Sigma Row
-            RowLayout {
-                Layout.fillWidth: true
-                Layout.leftMargin: 14
-                Layout.rightMargin: 14
-                Layout.preferredHeight: 32
-                Label {
-                    text: "3Σ VALUE"
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontSm
-                    font.bold: true
-                }
-                Item { Layout.fillWidth: true }
-                Label {
-                    text: s.threeSigma !== undefined ? s.threeSigma : "—"
-                    color: Theme.headingColor
-                    font.family: Theme.codeFontFamily
-                    font.pixelSize: Theme.fontLg
-                    font.bold: true
-                }
-            }
-        }
-    }
-
-    Rectangle {
-        Layout.fillWidth: true
-        implicitHeight: displayCard.implicitHeight + 24
-        color: Theme.sidePanelBackground
-        radius: Theme.sidePanelRadius
-        border.color: Theme.sideBorder
-        border.width: 1
+        Layout.preferredHeight: displayCard.implicitHeight + 24
 
         ColumnLayout {
             id: displayCard
-            anchors {
-                left: parent.left
-                right: parent.right
-                top: parent.top
-                margins: 12
-            }
+            anchors.fill: parent
+            anchors.margins: 12
             spacing: 8
 
-            Label {
-                text: "DISPLAY"
-                color: Theme.sideMutedText
-                font.family: Theme.uiFontFamily
-                font.pixelSize: Theme.fontSm
-                font.letterSpacing: 1.5
-                font.bold: true
-                Layout.bottomMargin: 4
-            }
+            SectionTitle { text: "DISPLAY" }
 
             PanelCheckBox {
                 id: thicknessToggle
                 text: "Show Thickness"
                 checked: false
                 font.pixelSize: Theme.fontSm
+                // First check with no data prompts for the customer CSV;
+                // unchecking only hides the overlay, data stays loaded.
+                onToggled: {
+                    if (checked && !root.hasThicknessData)
+                        thicknessDialog.open();
+                }
+            }
+
+            FileDialog {
+                id: thicknessDialog
+                title: "Select Thickness Data File"
+                nameFilters: ["CSV files (*.csv)"]
+                onAccepted: root.thicknessFileChosen(String(selectedFile).replace(/^file:\/\//, ""))
+                onRejected: thicknessToggle.checked = false
             }
 
             PanelCheckBox {
@@ -452,6 +149,13 @@ ColumnLayout {
                 font.pixelSize: Theme.fontSm
             }
 
+            PanelCheckBox {
+                id: extremesToggle
+                text: "Highlight Min/Max"
+                checked: true
+                font.pixelSize: Theme.fontSm
+            }
+
             PanelCheckBox {
                 id: clusterAverageToggle
                 text: "Average Clusters"
@@ -475,7 +179,7 @@ ColumnLayout {
                     font.pixelSize: Theme.fontSm
                     Layout.preferredWidth: 52
                 }
-                Slider {
+                PanelSlider {
                     id: heatmapSlider
                     from: 0
                     to: 1
@@ -486,19 +190,6 @@ ColumnLayout {
                         visible: heatmapSlider.hovered
                         text: Math.round(heatmapSlider.value * 100) + "%"
                     }
-
-                    handle: Rectangle {
-                        x: heatmapSlider.leftPadding + heatmapSlider.visualPosition * (heatmapSlider.availableWidth - width)
-                        y: heatmapSlider.topPadding + heatmapSlider.availableHeight / 2 - height / 2
-                        implicitWidth: 18
-                        implicitHeight: 18
-                        radius: 9
-                        color: Theme.primaryAccent
-                        scale: heatmapSlider.pressed ? 1.15 : 1.0
-                        Behavior on scale {
-                            NumberAnimation { duration: Theme.durationFast; easing.type: Theme.easeStandard }
-                        }
-                    }
                 }
                 Label {
                     text: Math.round(heatmapSlider.value * 100) + "%"
@@ -512,33 +203,18 @@ ColumnLayout {
         }
     }
 
-    Rectangle {
+    // ── THRESHOLDS ──────────────────────────────────────────────────
+    PanelBox {
         Layout.fillWidth: true
-        implicitHeight: thresholdCard.implicitHeight + 24
-        color: Theme.sidePanelBackground
-        radius: Theme.sidePanelRadius
-        border.color: Theme.sideBorder
-        border.width: 1
+        Layout.preferredHeight: thresholdCard.implicitHeight + 24
 
         ColumnLayout {
             id: thresholdCard
-            anchors {
-                left: parent.left
-                right: parent.right
-                top: parent.top
-                margins: 12
-            }
+            anchors.fill: parent
+            anchors.margins: 12
             spacing: 6
 
-            Label {
-                text: "THRESHOLDS"
-                color: Theme.sideMutedText
-                font.family: Theme.uiFontFamily
-                font.pixelSize: Theme.fontSm
-                font.letterSpacing: 1.5
-                font.bold: true
-                Layout.bottomMargin: 4
-            }
+            SectionTitle { text: "THRESHOLDS" }
 
             Label {
                 text: "Set Point (°C)"

src/pygui/ISC/Tabs/components/RunChart.qml

@@ -0,0 +1,135 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import ISC
+import ISC.Wafer
+
+// ===== Run Chart =====
+// Zoomable whole-run multi-sensor chart (C# parity: PopupChartForm.cs).
+// Lives in the Graph tab. Mouse wheel zooms around the cursor, drag pans;
+// the strip below shows the aggregate min/max/avg over the *visible* range
+// (not the whole run), matching PopupChartForm's recalc_stats. Cursor/
+// playhead tracking is out of scope — see specs/plans/2026-07-10-popup-chart.md
+// and docs/adr/0004-graphquickitem-viewport-for-replay-chart.md.
+Item {
+    id: root
+
+    property alias sensorNames: chart.sensorNames
+    property alias seriesData: chart.seriesData
+    property alias title: chart.title
+
+    ColumnLayout {
+        anchors.fill: parent
+        spacing: 8
+
+        Item {
+            Layout.fillWidth: true
+            Layout.fillHeight: true
+
+            GraphQuickItem {
+                id: chart
+                anchors.fill: parent
+                showMinMaxMarkers: true
+                xLabel: "Measurement Interval"
+                yLabel: "Temperature (°C)"
+            }
+
+            MouseArea {
+                id: interaction
+                anchors.fill: parent
+                acceptedButtons: Qt.LeftButton
+                property real lastX: 0
+
+                onWheel: function(wheel) {
+                    var frac = Math.max(0, Math.min(1, wheel.x / width));
+                    var factor = wheel.angleDelta.y > 0 ? 0.8 : 1.25;
+                    chart.zoomAtFraction(frac, factor);
+                    wheel.accepted = true;
+                }
+                onPressed: function(mouse) {
+                    lastX = mouse.x;
+                }
+                onPositionChanged: function(mouse) {
+                    if (pressed && width > 0) {
+                        chart.panByFraction(-(mouse.x - lastX) / width);
+                        lastX = mouse.x;
+                    }
+                }
+            }
+        }
+
+        // ── Min/Max/Avg readout strip + Reset Zoom ─────────────────────
+        RowLayout {
+            Layout.fillWidth: true
+            spacing: 16
+
+            Label {
+                text: "Min:"
+                color: Theme.sensorLow
+                font.family: Theme.uiFontFamily
+                font.pixelSize: Theme.fontSm
+                font.weight: Font.Medium
+            }
+            Label {
+                text: chart.viewMin.toFixed(2) + (chart.viewMinSensor ? "  (" + chart.viewMinSensor + ")" : "")
+                color: Theme.headingColor
+                font.family: Theme.codeFontFamily
+                font.pixelSize: Theme.fontSm
+            }
+
+            Label {
+                text: "Max:"
+                color: Theme.sensorHigh
+                font.family: Theme.uiFontFamily
+                font.pixelSize: Theme.fontSm
+                font.weight: Font.Medium
+            }
+            Label {
+                text: chart.viewMax.toFixed(2) + (chart.viewMaxSensor ? "  (" + chart.viewMaxSensor + ")" : "")
+                color: Theme.headingColor
+                font.family: Theme.codeFontFamily
+                font.pixelSize: Theme.fontSm
+            }
+
+            Label {
+                text: "Avg:"
+                color: Theme.sideMutedText
+                font.family: Theme.uiFontFamily
+                font.pixelSize: Theme.fontSm
+                font.weight: Font.Medium
+            }
+            Label {
+                text: chart.viewAvg.toFixed(2)
+                color: Theme.headingColor
+                font.family: Theme.codeFontFamily
+                font.pixelSize: Theme.fontSm
+            }
+
+            Item { Layout.fillWidth: true }
+
+            Button {
+                id: resetZoomBtn
+                implicitHeight: 32
+                hoverEnabled: true
+                text: "Reset Zoom"
+                font.family: Theme.uiFontFamily
+                font.pixelSize: Theme.fontSm
+                font.weight: Font.Medium
+                background: Rectangle {
+                    radius: Theme.radiusSm
+                    color: resetZoomBtn.pressed ? Theme.transportButtonHover : Theme.transportButtonBg
+                    border.color: Theme.sideBorder
+                    border.width: 1
+                }
+                contentItem: Text {
+                    text: resetZoomBtn.text
+                    color: Theme.headingColor
+                    font: resetZoomBtn.font
+                    horizontalAlignment: Text.AlignHCenter
+                    verticalAlignment: Text.AlignVCenter
+                }
+                onClicked: chart.resetZoom()
+            }
+        }
+    }
+}

src/pygui/ISC/Tabs/components/StatusActionsPanel.qml

@@ -57,6 +57,17 @@ ColumnLayout {
                 onClicked: deviceController.eraseMemory(
                     deviceController.selectedPort)
             }
+
+            RailActionButton {
+                label: "READ DEBUG"
+                iconSource: "../icons/read.svg"
+                Layout.fillWidth: true
+                // One-shot toggle: "on" while the debug read is in flight,
+                // resets automatically once deviceController flips status.
+                toggled: deviceController.connectionStatus === "Reading debug..."
+                enabled: deviceController.waferDetected && !deviceController.operationInProgress
+                onClicked: deviceController.readDebug(deviceController.selectedPort)
+            }
         }
     }
 

src/pygui/ISC/Tabs/components/StreamControlPanel.qml

@@ -0,0 +1,374 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Controls.impl
+import QtQuick.Dialogs
+import QtQuick.Layouts
+import ISC
+
+Rectangle {
+    id: root
+    Layout.fillWidth: true
+    implicitHeight: contentCol.implicitHeight + 24
+
+    color: Theme.sidePanelBackground
+    radius: Theme.sidePanelRadius
+    border.color: Theme.sideBorder
+    border.width: 1
+
+    signal exportRequested(string filePath, string extra)
+
+    property int _liveSecs: 0
+    Connections {
+        target: streamController
+        function onModeChanged() {
+            if (streamController.mode === "review" && modeBar.currentIndex !== 0) {
+                modeBar.currentIndex = 0;
+            }
+        }
+    }
+    Timer {
+        id: liveTimer
+        interval: 1000
+        repeat: true
+        running: streamController.mode === "live" && streamController.state !== "idle"
+        onTriggered: root._liveSecs++
+        onRunningChanged: if (!running) root._liveSecs = 0
+    }
+
+    function fmtTime(s) {
+        var m = Math.floor(s / 60);
+        var ss = s % 60;
+        return (m < 10 ? "0" : "") + m + ":" + (ss < 10 ? "0" : "") + ss;
+    }
+
+    function switchToReview() {
+        modeBar.currentIndex = 0;
+    }
+
+    ColumnLayout {
+        id: contentCol
+        anchors {
+            fill: parent
+            topMargin: 10
+            leftMargin: 12
+            rightMargin: 12
+            bottomMargin: 12
+        }
+        spacing: 8
+
+        RowLayout {
+            Layout.fillWidth: true
+            spacing: 6
+
+            TabBar {
+                id: modeBar
+                currentIndex: 0
+                spacing: 2
+                padding: 2
+                Layout.fillWidth: true
+                Layout.preferredHeight: 28
+                background: Rectangle {
+                    color: Theme.subtleSectionBackground
+                    radius: Theme.radiusXs
+                    border.color: Theme.cardBorder
+                    border.width: 1
+                }
+
+                TabButton {
+                    text: "Review"
+                    Layout.fillWidth: true
+                    implicitHeight: 24
+                    font.pixelSize: Theme.fontMd
+                    font.weight: parent.checked ? Font.Medium : Font.Normal
+                    background: Rectangle {
+                        color: parent.checked ? Theme.tabActiveBackground : "transparent"
+                        radius: Theme.radiusXs - 1
+                    }
+                    contentItem: Text {
+                        text: parent.text
+                        color: parent.checked ? Theme.headingColor : Theme.bodyColor
+                        font: parent.font
+                        horizontalAlignment: Text.AlignHCenter
+                        verticalAlignment: Text.AlignVCenter
+                    }
+                }
+
+                TabButton {
+                    id: liveTab
+                    text: "Live"
+                    enabled: deviceController.connectionStatus === "Connected"
+                    opacity: enabled ? 1.0 : 0.4
+                    Layout.fillWidth: true
+                    implicitHeight: 24
+                    font.pixelSize: Theme.fontMd
+                    font.weight: parent.checked ? Font.Medium : Font.Normal
+
+                    AppToolTip {
+                        visible: disabledHover.containsMouse && !liveTab.enabled
+                        text: "Connect a wafer to enable Live mode"
+                        delay: 300
+                    }
+
+                    MouseArea {
+                        id: disabledHover
+                        anchors.fill: parent
+                        enabled: !liveTab.enabled
+                        hoverEnabled: true
+                        acceptedButtons: Qt.NoButton
+                    }
+
+                    background: Rectangle {
+                        color: parent.checked ? Theme.tabActiveBackground : "transparent"
+                        radius: Theme.radiusXs - 1
+                    }
+
+                    contentItem: Item {
+                        Row {
+                            spacing: 4
+                            anchors.centerIn: parent
+                            Rectangle {
+                                id: liveTabDot
+                                width: 5; height: 5; radius: 2.5
+                                anchors.verticalCenter: parent.verticalCenter
+                                color: liveTab.enabled ? Theme.metricGood : Theme.sideMutedText
+
+                                SequentialAnimation on opacity {
+                                    running: streamController.mode === "live" && streamController.state !== "idle"
+                                    loops: Animation.Infinite
+                                    NumberAnimation { to: 0.2; duration: 600; easing.type: Easing.InOutQuad }
+                                    NumberAnimation { to: 1.0; duration: 600; easing.type: Easing.InOutQuad }
+                                    onRunningChanged: if (!running) liveTabDot.opacity = 1.0
+                                }
+                            }
+                            Text {
+                                text: liveTab.text
+                                color: liveTab.checked ? Theme.headingColor : Theme.bodyColor
+                                font: liveTab.font
+                                verticalAlignment: Text.AlignVCenter
+                                height: parent.height
+                            }
+                    }
+                }
+            }
+
+            onCurrentIndexChanged: {
+                    if (currentIndex === 1) {
+                        if (deviceController.connectionStatus !== "Connected") {
+                            currentIndex = 0;
+                            return;
+                        }
+                        streamController.setMode("live");
+                        var fc = "";
+                        if (deviceController.lastWaferInfo && deviceController.lastWaferInfo.length > 0) {
+                            fc = deviceController.lastWaferInfo[0];
+                        }
+                        streamController.startStream(deviceController.selectedPort, fc);
+                    } else {
+                        streamController.setMode("review");
+                    }
+                }
+            }
+        }
+
+        Rectangle {
+            Layout.fillWidth: true
+            height: 1
+            color: Theme.cardBorder
+        }
+
+        Label {
+            text: "METRICS"
+            color: Theme.sideMutedText
+            font.family: Theme.uiFontFamily
+            font.pixelSize: Theme.fontMd
+            font.letterSpacing: 1.5
+            font.bold: true
+            Layout.bottomMargin: 2
+        }
+
+        MetricRow {
+            label: "Received Frames"
+            value: modeBar.currentIndex === 1 ? streamController.receivedCount : "—"
+        }
+
+        MetricRow {
+            label: "Errors"
+            value: modeBar.currentIndex === 1 ? streamController.errorCount : "—"
+            valueColor: streamController.errorCount > 0 ? Theme.statusWarningColor : Theme.headingColor
+        }
+
+        MetricRow {
+            label: "Resyncs"
+            value: modeBar.currentIndex === 1 ? streamController.resyncCount : "—"
+        }
+
+        MetricRow {
+            label: "Elapsed"
+            value: modeBar.currentIndex === 1 ? root.fmtTime(root._liveSecs) : "—"
+        }
+
+        Rectangle {
+            Layout.fillWidth: true
+            height: 1
+            color: Theme.cardBorder
+        }
+
+        Label {
+            text: "ACTIONS"
+            color: Theme.sideMutedText
+            font.family: Theme.uiFontFamily
+            font.pixelSize: Theme.fontMd
+            font.letterSpacing: 1.5
+            font.bold: true
+            Layout.bottomMargin: 2
+        }
+
+        RowLayout {
+            Layout.fillWidth: true
+            spacing: 6
+
+            Button {
+                id: recordBtn
+                Layout.fillWidth: true
+                implicitHeight: 28
+                enabled: streamController.mode === "live"
+                opacity: enabled ? 1.0 : 0.4
+                text: streamController.recording ? "Stop REC" : "Record"
+
+                AppToolTip {
+                    visible: recordBtn.hovered && !recordBtn.enabled
+                    text: "Connect to Live to start recording"
+                    delay: 300
+                }
+
+                onClicked: {
+                    if (streamController.recording) {
+                        streamController.stopRecording();
+                    } else {
+                        var info = deviceController.lastWaferInfo;
+                        var serial = (info && info.length > 1) ? info[1] : "";
+                        var ts = Qt.formatDateTime(new Date(), "yyyyMMdd_HHmmss");
+                        var name = "live_" + (serial ? serial + "_" : "") + ts + ".csv";
+                        streamController.startRecording(deviceController.saveDataDir + "/" + name, serial);
+                    }
+                }
+
+                background: Rectangle {
+                    radius: Theme.radiusSm
+                    color: recordBtn.down ? Theme.transportButtonHover
+                         : (recordBtn.hovered ? Theme.transportButtonBg : "transparent")
+                    border.width: Theme.borderThin
+                    border.color: Theme.sideBorder
+                }
+                contentItem: Text {
+                    text: recordBtn.text
+                    color: Theme.headingColor
+                    font.pixelSize: Theme.fontMd
+                    font.weight: Font.Medium
+                    horizontalAlignment: Text.AlignHCenter
+                    verticalAlignment: Text.AlignVCenter
+                }
+            }
+
+            Button {
+                id: exportBtn
+                Layout.fillWidth: true
+                implicitHeight: 28
+                text: "Export"
+                // Nothing to export until a file is loaded or a stream has played
+                enabled: streamController.sensorValues.length > 0
+                opacity: enabled ? 1 : 0.4
+
+                onClicked: {
+                    // Default into <saveDataDir>/Export (created on demand)
+                    exportDialog.selectedFile = "file://" + deviceController.exportDir() + "/wafer_map.png"
+                    exportDialog.open()
+                }
+
+                background: Rectangle {
+                    radius: Theme.radiusSm
+                    color: exportBtn.down ? Theme.transportButtonHover
+                         : (exportBtn.hovered ? Theme.transportButtonBg : "transparent")
+                    border.width: Theme.borderThin
+                    border.color: Theme.sideBorder
+                }
+                contentItem: Text {
+                    text: exportBtn.text
+                    color: Theme.headingColor
+                    font.pixelSize: Theme.fontMd
+                    font.weight: Font.Medium
+                    horizontalAlignment: Text.AlignHCenter
+                    verticalAlignment: Text.AlignVCenter
+                }
+            }
+
+            FileDialog {
+                id: exportDialog
+                title: "Export Wafer Map"
+                fileMode: FileDialog.SaveFile
+                defaultSuffix: "png"
+                nameFilters: ["PNG files (*.png)"]
+                onAccepted: {
+                    var path = String(selectedFile).replace(/^file:\/\//, "");
+                    var extra = "";
+                    if (streamController.mode === "live") {
+                        extra = "Frames: " + streamController.receivedCount
+                              + "   Errors: " + streamController.errorCount
+                              + "   Resyncs: " + streamController.resyncCount
+                              + "   Elapsed: " + root.fmtTime(root._liveSecs);
+                    }
+                    root.exportRequested(path, extra);
+                }
+            }
+        }
+
+        Rectangle {
+            Layout.fillWidth: true
+            height: 1
+            color: Theme.cardBorder
+        }
+
+        Button {
+            id: primaryBtn
+            Layout.fillWidth: true
+            implicitHeight: 32
+            text: streamController.mode === "live" ? "STOP" : "START"
+            enabled: streamController.mode === "live"
+                     ? true
+                     : deviceController.connectionStatus === "Connected"
+            opacity: enabled ? 1.0 : 0.4
+
+            AppToolTip {
+                visible: primaryBtn.hovered && !primaryBtn.enabled
+                text: "Connect a wafer to enable Live mode"
+                delay: 300
+            }
+
+            onClicked: {
+                if (streamController.mode === "live") {
+                    streamController.stopStream();
+                    modeBar.currentIndex = 0;
+                } else {
+                    modeBar.currentIndex = 1;
+                }
+            }
+
+            background: Rectangle {
+                radius: Theme.radiusSm
+                color: primaryBtn.down ? Theme.transportButtonHover
+                     : (primaryBtn.hovered ? Theme.transportButtonBg : "transparent")
+                border.width: Theme.borderThin
+                border.color: Theme.sideBorder
+            }
+            contentItem: Text {
+                text: primaryBtn.text
+                color: Theme.headingColor
+                font.pixelSize: Theme.fontMd
+                font.weight: Font.Medium
+                font.letterSpacing: 1.0
+                horizontalAlignment: Text.AlignHCenter
+                verticalAlignment: Text.AlignVCenter
+            }
+        }
+    }
+}

src/pygui/ISC/Tabs/components/StreamStatsDialog.qml

@@ -1,130 +0,0 @@
-import QtQuick
-import QtQuick.Layouts
-import QtQuick.Controls
-import QtQuick.Controls.impl
-import ISC
-
-// ===== Stream Stats Dialog =====
-// Popup showing live stream statistics: received frames, errors,
-// resync count, and elapsed time. Opened from the Live toolbar.
-
-Popup {
-    id: root
-    modal: true
-    dim: true
-    closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside
-    width: 320
-    implicitHeight: content.implicitHeight + 40
-    anchors.centerIn: Overlay.overlay
-
-    // Elapsed seconds supplied by the Live timer in WaferMapTab.
-    property int elapsedSecs: 0
-
-    function fmtTime(s) {
-        var m = Math.floor(s / 60);
-        var ss = s % 60;
-        return (m < 10 ? "0" : "") + m + ":" + (ss < 10 ? "0" : "") + ss;
-    }
-
-    background: Rectangle {
-        radius: Theme.radiusMd
-        color: Theme.cardBackground
-        border.color: Theme.cardBorder
-        border.width: 1
-    }
-
-    component StatRow: RowLayout {
-        property string label
-        property string value
-        Layout.fillWidth: true
-        spacing: 8
-
-        Label {
-            text: label
-            color: Theme.bodyColor
-            font.pixelSize: Theme.fontXs
-            Layout.fillWidth: true
-        }
-        Label {
-            text: value
-            color: Theme.headingColor
-            font.pixelSize: Theme.fontSm
-            font.weight: Font.Medium
-        }
-    }
-
-    ColumnLayout {
-        id: content
-        anchors.fill: parent
-        anchors.margins: 20
-        spacing: 16
-
-        // ── Header ────────────────────────────────────────────────
-        RowLayout {
-            Layout.fillWidth: true
-            spacing: 10
-
-            Label {
-                text: "STREAM DATA"
-                font.pixelSize: Theme.fontLg
-                font.bold: true
-                color: Theme.headingColor
-                Layout.fillWidth: true
-            }
-
-            Button {
-                flat: true
-                Layout.preferredWidth: 32
-                Layout.preferredHeight: 32
-                onClicked: root.close()
-
-                background: Rectangle {
-                    radius: Theme.radiusXs
-                    color: parent.hovered ? Theme.buttonNeutralHover : "transparent"
-                }
-                contentItem: IconImage {
-                    source: "../icons/x.svg"
-                    width: 14; height: 14
-                    sourceSize.width: 14
-                    sourceSize.height: 14
-                    color: Theme.bodyColor
-                    anchors.centerIn: parent
-                }
-            }
-        }
-
-        // ── Stats box ─────────────────────────────────────────────
-        Rectangle {
-            Layout.fillWidth: true
-            implicitHeight: statRows.implicitHeight + 20
-            radius: Theme.radiusSm
-            color: Theme.subtleSectionBackground
-            border.color: Theme.cardBorder
-            border.width: 1
-
-            ColumnLayout {
-                id: statRows
-                anchors.fill: parent
-                anchors.margins: 10
-                spacing: 8
-
-                StatRow {
-                    label: "Received frames"
-                    value: streamController.receivedCount
-                }
-                StatRow {
-                    label: "Errors"
-                    value: streamController.errorCount
-                }
-                StatRow {
-                    label: "Resyncs"
-                    value: streamController.resyncCount
-                }
-                StatRow {
-                    label: "Elapsed"
-                    value: root.fmtTime(root.elapsedSecs)
-                }
-            }
-        }
-    }
-}

src/pygui/ISC/Tabs/components/TransportBar.qml

@@ -42,15 +42,69 @@ Item {
                 spacing: 24
 
                 // Frame counter
-                Text {
+                Row {
+                    spacing: 6
                     anchors.verticalCenter: parent.verticalCenter
-                    text: "Frame " + (streamController.frameIndex + 1)
-                        + " / " + streamController.frameTotal
-                    color: Theme.sideMutedText
-                    font.family: Theme.uiFontFamily
-                    font.pixelSize: Theme.fontMd
-                    font.weight: Font.Medium
-                    leftPadding: 8
+
+                    Label {
+                        text: "Frame"
+                        color: Theme.sideMutedText
+                        font.family: Theme.uiFontFamily
+                        font.pixelSize: Theme.fontMd
+                        font.weight: Font.Medium
+                        anchors.verticalCenter: parent.verticalCenter
+                    }
+
+                    TextField {
+                        id: frameInput
+                        text: String(streamController.frameIndex + 1)
+                        font.pixelSize: Theme.fontMd
+                        font.weight: Font.Medium
+                        font.family: Theme.codeFontFamily
+                        color: Theme.headingColor
+                        verticalAlignment: TextInput.AlignVCenter
+                        horizontalAlignment: TextInput.AlignHCenter
+                        selectByMouse: true
+                        inputMethodHints: Qt.ImhDigitsOnly
+                        padding: 0
+                        width: Math.max(44, contentWidth + 16)
+                        height: 28
+                        anchors.verticalCenter: parent.verticalCenter
+
+                        background: Rectangle {
+                            color: Theme.fieldBackground
+                            radius: Theme.radiusXs
+                            border.color: frameInput.activeFocus ? Theme.fieldBorderFocus : (frameInput.hovered ? Theme.fieldBorderFocus : Theme.sideBorder)
+                            border.width: 1
+                        }
+
+                        onEditingFinished: {
+                            var val = parseInt(text)
+                            if (!isNaN(val)) {
+                                var targetFrame = Math.max(1, Math.min(val, streamController.frameTotal))
+                                streamController.seek(targetFrame - 1)
+                            }
+                            text = String(streamController.frameIndex + 1)
+                        }
+
+                        Connections {
+                            target: streamController
+                            function onFrameUpdated() {
+                                if (!frameInput.activeFocus) {
+                                    frameInput.text = String(streamController.frameIndex + 1)
+                                }
+                            }
+                        }
+                    }
+
+                    Label {
+                        text: "/ " + streamController.frameTotal
+                        color: Theme.sideMutedText
+                        font.family: Theme.uiFontFamily
+                        font.pixelSize: Theme.fontMd
+                        font.weight: Font.Medium
+                        anchors.verticalCenter: parent.verticalCenter
+                    }
                 }
 
                 // Separator 1
@@ -124,7 +178,7 @@ Item {
                     Button {
                         id: playPauseBtn
                         anchors.verticalCenter: parent.verticalCenter
-                        implicitWidth: 64
+                        implicitWidth: 56
                         implicitHeight: 56
                         hoverEnabled: true
                         background: Rectangle {

src/pygui/ISC/Tabs/components/UtilityFooter.qml

@@ -14,6 +14,9 @@ Rectangle {
     border.width: 1
     color: Theme.sidePanelBackground
 
+    property var settingsPopup: null
+    property var aboutDialog: null
+
     RowLayout {
         anchors.fill: parent
         anchors.margins: 4
@@ -25,7 +28,7 @@ Rectangle {
             Layout.fillWidth: true
             Layout.fillHeight: true
             icon.source: "../icons/settings.svg"
-            onClicked: utilFooter.parent.settingsPopup.open()
+            onClicked: if (settingsPopup) settingsPopup.open()
 
             background: Rectangle {
                 radius: 8
@@ -73,7 +76,7 @@ Rectangle {
             Layout.fillWidth: true
             Layout.fillHeight: true
             icon.source: "../icons/about.svg"
-            onClicked: utilFooter.parent.aboutDialog.open()
+            onClicked: if (aboutDialog) aboutDialog.open()
 
             background: Rectangle {
                 radius: 8

src/pygui/ISC/Tabs/components/WaferMapView.qml

@@ -7,7 +7,9 @@ Item {
     id: root
     property real blend: 0.0
     property bool showLabels: true
+    property alias showExtremes: map.showExtremes
     property alias showThickness: map.showThickness
+    property alias hasThickness: map.hasThickness
 
     WaferMapItem {
         id: map
@@ -39,7 +41,9 @@ Item {
         HoverHandler {
             id: hoverHandler
             onPointChanged: {
-                map.hoveredIndex = map.which_marker(hoverHandler.point.position.x, hoverHandler.point.position.y);
+                map.hoveredIndex = streamController.mode === "live"
+                    ? -1
+                    : map.which_marker(hoverHandler.point.position.x, hoverHandler.point.position.y);
             }
             onHoveredChanged: if (!hoverHandler.hovered) map.hoveredIndex = -1
             cursorShape: map.hoveredIndex >= 0 ? Qt.PointingHandCursor : Qt.ArrowCursor
@@ -47,6 +51,8 @@ Item {
 
         TapHandler {
             onTapped: ev => {
+                if (streamController.mode === "live")
+                    return;
                 var idx = map.which_marker(ev.position.x, ev.position.y);
                 if (idx >= 0)
                     replaceDialog.openFor(idx);
@@ -58,7 +64,11 @@ Item {
         id: replaceDialog
     }
 
-    function exportImage(filePath) {
-        return map.export_image(filePath);
+    function exportImage(filePath, extra) {
+        return map.export_image(filePath, extra || "");
+    }
+
+    function loadThickness(filePath) {
+        return map.loadThickness(filePath);
     }
 }

src/pygui/ISC/Tabs/components/qmldir

@@ -8,12 +8,13 @@ ReplaceSensorDialog 1.0 ReplaceSensorDialog.qml
 RailActionButton 1.0 RailActionButton.qml
 SelectFileDialog 1.0 SelectFileDialog.qml
 SplitDialog 1.0 SplitDialog.qml
-StreamStatsDialog 1.0 StreamStatsDialog.qml
+StreamControlPanel 1.0 StreamControlPanel.qml
 StatusActionsPanel 1.0 StatusActionsPanel.qml
 ConnectionFooter 1.0 ConnectionFooter.qml
 UtilityFooter 1.0 UtilityFooter.qml
 PanelCheckBox 1.0 PanelCheckBox.qml
 ReadoutStat 1.0 ReadoutStat.qml
+MetricRow 1.0 MetricRow.qml
 AppToolTip 1.0 AppToolTip.qml
 SectionTitle 1.0 SectionTitle.qml
 PanelBox 1.0 PanelBox.qml
@@ -22,3 +23,4 @@ EditableScrubStat 1.0 EditableScrubStat.qml
 ComparisonChartCard 1.0 ComparisonChartCard.qml
 OverlapMapCard 1.0 OverlapMapCard.qml
 ComparisonSidePanel 1.0 ComparisonSidePanel.qml
+RunChart 1.0 RunChart.qml

src/pygui/ISC/Theme.qml

@@ -206,6 +206,7 @@ QtObject {
     readonly property int panelPadding: 12
     // Side rail layout
     readonly property int sideRailWidth: 300
+    readonly property int rightRailWidth: 280
     readonly property int sideRailMargin: 16
     readonly property int sideRailSpacing: 16
     readonly property int sideButtonHeight: 44

src/pygui/__main__.py

@@ -74,6 +74,9 @@ def main() -> int:
     device_controller = DeviceController(raw_settings, data_dir)
     engine.rootContext().setContextProperty("deviceController", device_controller)
 
+    # Source panel browses the same folder recordings/reads are saved to.
+    select_file_dialog_model.setCurrentDirectory(str(device_controller.saveDataDir))
+
     # ===== License Model (About dialog grid, replay trial) =====
     license_model = LicenseModel(data_dir)
     engine.rootContext().setContextProperty("licenseModel", license_model)

src/pygui/backend/controllers/device_controller.py

@@ -18,9 +18,11 @@ from pygui.backend.models.data_model import TemperatureTableModel
 from pygui.backend.utils import slot_error_boundary
 from pygui.backend.visualization.graph_view import GraphView
 from pygui.serialcomm.data_parser import (
+    convert_to_debug_temperatures,
     convert_to_temperatures,
     parse_binary_data,
     remove_trailing_zeros,
+    save_debug_csv,
     save_to_csv,
 )
 from pygui.serialcomm.serial_port import WaferInfo
@@ -139,6 +141,14 @@ class DeviceController(QObject):
         self._append_log(f"Save data dir set to: {path}")
         self._save_status()
 
+    @Slot(result=str)
+    @slot_error_boundary
+    def exportDir(self) -> str:
+        """Ensure and return the Export subfolder under saveDataDir."""
+        path = Path(self._save_data_dir) / "Export"
+        path.mkdir(parents=True, exist_ok=True)
+        return str(path)
+
     @Slot(str)
     @slot_error_boundary
     def openCsvFile(self, file_path: str) -> None:
@@ -547,10 +557,29 @@ class DeviceController(QObject):
                 self._debugFinished.emit({"error": "F1 read failed"})
                 return
 
+            fc = (
+                self._last_wafer_info.get("familyCode", "")
+                if self._last_wafer_info
+                else ""
+            )
+            sensor_hex = parse_binary_data(sensor_data, fc)
+            debug_hex = parse_binary_data(debug_data, fc)
+            if not sensor_hex or not debug_hex:
+                self._debugFinished.emit({"error": "Debug binary parse failed"})
+                return
+
+            temp_data = convert_to_temperatures(sensor_hex, fc)
+            debug_temp_data = convert_to_debug_temperatures(debug_hex)
+            csv_path = save_debug_csv(temp_data, debug_temp_data, self._save_data_dir)
+            if csv_path is None:
+                self._debugFinished.emit({"error": "Debug CSV save failed"})
+                return
+
             self._debugFinished.emit({
                 "success": True,
                 "sensor_bytes": len(sensor_data),
                 "debug_bytes": len(debug_data),
+                "csv_path": csv_path,
             })
         except Exception as exc:
             log.exception("Debug worker crashed: %s", exc)
@@ -564,10 +593,11 @@ class DeviceController(QObject):
             self._set_connection_status("Connected")
             sensor_bytes = result.get("sensor_bytes", 0)
             debug_bytes = result.get("debug_bytes", 0)
-            self._append_log(
-                f"Debug read complete: {sensor_bytes} sensor bytes, "
-                f"{debug_bytes} debug bytes"
-            )
+            csv_path = result.get("csv_path", "")
+            msg = f"Debug read complete: {sensor_bytes} sensor bytes, {debug_bytes} debug bytes"
+            if csv_path:
+                msg += f", CSV written to {csv_path}"
+            self._append_log(msg)
         else:
             self._set_connection_status("Disconnected")
             err_msg = result.get("error", "Debug read failed")

src/pygui/backend/controllers/session_controller.py

@@ -11,12 +11,17 @@ from PySide6.QtCore import Property, QObject, Qt, QTimer, Signal, Slot
 from pygui.backend.cluster_average import average_clusters, group_sensors_by_radius
 from pygui.backend.data.csv_recorder import CsvRecorder
 from pygui.backend.models.frame import Frame
-from pygui.backend.models.frame_player import FramePlayer, frames_from_wafer_data
-from pygui.backend.models.replay_stats import ReplayStatsTracker
+from pygui.backend.models.frame_player import (
+    FramePlayer,
+    all_sensor_series,
+    frames_from_wafer_data,
+)
+from pygui.backend.models.frame_stats import compute_edge_center
 from pygui.backend.models.sensor_editor import SensorEditor
 from pygui.backend.models.session_model import SessionModel, SessionUpdate
 from pygui.backend.models.threshold_classifier import ThresholdConfig
 from pygui.backend.utils import slot_error_boundary
+from pygui.backend.wafer.wafer_layouts import ec_pairs_for_wafer_id
 from pygui.backend.wafer.zwafer_models import Sensor
 from pygui.backend.wafer.zwafer_parser import ZWaferParser
 from pygui.serialcomm.stream_reader import StreamReader
@@ -39,7 +44,8 @@ class SessionController(QObject):
     clusterAveragingEnabledChanged = Signal()
     liveStatsChanged = Signal()  # emitted when receivedCount or errorCount change
     # trend: per-frame avg for live graph
-    trendData = Signal(str)  # JSON array of floats
+    trendDelta = Signal(str)  # JSON [[elapsed_s, avg]] — one new point per live frame
+    trendReset = Signal()  # live trend buffer cleared (new stream started)
     # NOTE: dict (QVariantMap), not object — Signal(object) delivers Python
     # dicts to QML as an opaque empty wrapper with no accessible fields.
     comparisonResult = Signal(dict)  # dict with success, distance, warping_path, max_sensor_deviation, series_a, series_b
@@ -59,13 +65,7 @@ class SessionController(QObject):
         self._sensors: list[Sensor] = []
         self._last: Optional[SessionUpdate] = None
         self._elapsed = 0.0
-        self._trend_buffer: list[float] = [] # rolling window
-        self._trend_timestamps: list[float] = []  # monotonic timestamps
-
-        # Trend refresh timer - update every 1s
-        self._trend_timer = QTimer(self)
-        self._trend_timer.setInterval(1000)
-        self._trend_timer.timeout.connect(self._flush_trend)
+        self._stream_start_time: float = 0.0
 
         self._play_timer = QTimer(self)
         self._play_timer.timeout.connect(self._advance)
@@ -81,11 +81,11 @@ class SessionController(QObject):
         self._liveError.connect(self._on_live_error, Qt.ConnectionType.QueuedConnection)
 
         self._sensor_editor = SensorEditor()
+        self._ec_pairs: tuple[tuple[int, int], ...] = ()
         self._last_raw_frame: Frame | None = None
         self._loaded_file: str = ""
         self._cluster_averaging_enabled = False
         self._active_clusters: list[list[int]] = []
-        self._stats_tracker = ReplayStatsTracker()
         self._received_count: int = 0
         self._error_count: int = 0
 
@@ -187,14 +187,42 @@ class SessionController(QObject):
         if not self._last:
             return {}
         s = self._last.stats
-        return {"min": round(s.min, 2), "minIndex": s.min_index + 1,
-                "max": round(s.max, 2), "maxIndex": s.max_index + 1,
-                "diff": round(s.diff, 2), "avg": round(s.avg, 2),
-                "sigma": round(s.sigma, 2), "threeSigma": round(s.three_sigma, 2)}
+        out = {"min": round(s.min, 2), "minIndex": s.min_index + 1,
+               "max": round(s.max, 2), "maxIndex": s.max_index + 1,
+               "diff": round(s.diff, 2), "avg": round(s.avg, 2),
+               "sigma": round(s.sigma, 2), "threeSigma": round(s.three_sigma, 2)}
+        ec = compute_edge_center(self._last.values, self._ec_pairs,
+                                 self._sensor_editor.replaced_indices())
+        if ec is not None:
+            out.update({
+                "ecMinEdgeIndex": ec.min_edge_index + 1,
+                "ecMinCenterIndex": ec.min_center_index + 1,
+                "ecMinEdgeValue": round(ec.min_edge, 2),
+                "ecMinCenterValue": round(ec.min_center, 2),
+                "ecMinDelta": round(ec.min_delta, 2),
+                "ecMaxEdgeIndex": ec.max_edge_index + 1,
+                "ecMaxCenterIndex": ec.max_center_index + 1,
+                "ecMaxEdgeValue": round(ec.max_edge, 2),
+                "ecMaxCenterValue": round(ec.max_center, 2),
+                "ecMaxDelta": round(ec.max_delta, 2),
+            })
+        return out
 
     @Property(str, notify=loadedFileChanged)
     def loadedFile(self) -> str: return self._loaded_file
 
+    @Property(str, notify=loadedFileChanged)
+    def graphSensorNames(self) -> str:
+        """Comma-joined sensor names for the whole-run Graph tab."""
+        names, _ = all_sensor_series(list(self._player.frames))
+        return ",".join(names)
+
+    @Property(str, notify=loadedFileChanged)
+    def graphSeriesJson(self) -> str:
+        """JSON per-sensor value series (one list per sensor) for the Graph tab."""
+        _, series = all_sensor_series(list(self._player.frames))
+        return json.dumps(series)
+
     @Property("QVariantList", notify=frameUpdated)  # type: ignore[arg-type]
     def overriddenSensors(self) -> list[int]:
         """Indices of sensors that currently have a replacement or offset."""
@@ -232,6 +260,12 @@ class SessionController(QObject):
             return
         if mode != "live":
             self.stopStream()
+            if self._mode == "live":
+                # Leaving a live session: blank the wafer map instead of
+                # freezing the last streamed frame on screen.
+                self._last = None
+                self._last_raw_frame = None
+                self.frameUpdated.emit()
         self._play_timer.stop()
         self._mode = mode
         self.modeChanged.emit()
@@ -287,21 +321,17 @@ class SessionController(QObject):
             wafer_id = stem.split("-")[0] if "-" in stem else stem
 
         shape, size = resolve_shape_and_size(sensors, wafer_id)
+        self._ec_pairs = ec_pairs_for_wafer_id(wafer_id)
         self._sensors = WaferLayout(sensors, shape=shape, size=size)
         self._active_clusters = getattr(self._sensors, 'clusters', [])
         if not self._active_clusters:
             self._active_clusters = group_sensors_by_radius(self._sensors)
         self._player.load(frames)
         self._model.reset()
-        self._stats_tracker.reset()
         self._loaded_file = file_path
         self.loadedFileChanged.emit()
         self.sensorsChanged.emit()
         self._emit_current()
-        # Populate stats tracker from all loaded frames for trend chart (P3.1)
-        for frame in self._player._frames:
-            self._stats_tracker.track(frame.seq, frame.values)
-        self.trendData.emit(json.dumps(self._stats_tracker.get_trend()))
 
     @Slot()
     @slot_error_boundary
@@ -309,7 +339,7 @@ class SessionController(QObject):
         """Clear the loaded file, resetting the player and frame states."""
         self._player.load([])
         self._model.reset()
-        self._stats_tracker.reset()
+        self._ec_pairs = ()
         self._loaded_file = ""
         self.loadedFileChanged.emit()
         self.sensorsChanged.emit()
@@ -659,6 +689,7 @@ class SessionController(QObject):
                 self.sensorsChanged.emit()
             except Exception as e:
                 log.warning("Could not load layout for %s: %s", family_code, e)
+        self._ec_pairs = ec_pairs_for_wafer_id(family_code)
 
         self._active_clusters = getattr(self._sensors, 'clusters', [])
         if not self._active_clusters:
@@ -689,10 +720,7 @@ class SessionController(QObject):
 
         # Clear out any old data from the prev sessions
         self._model.reset()
-        self._trend_buffer.clear()
-        self._trend_timestamps.clear()
-        self._trend_timer.start()
-        self._stats_tracker.reset()
+        self._reset_live_trend()
         self._last = None
         self._last_raw_frame = None
         self._received_count = 0
@@ -734,7 +762,6 @@ class SessionController(QObject):
     @slot_error_boundary
     def stopStream(self) -> None:
         self._repaint_timer.stop()
-        self._trend_timer.stop()
         self._received_count = 0
         self._error_count = 0
         self.liveStatsChanged.emit()
@@ -760,10 +787,8 @@ class SessionController(QObject):
     @Slot(object)
     @slot_error_boundary
     def _on_live_frame(self, frame: Frame) -> None:
-        import json
         self._received_count += 1
         self.liveStatsChanged.emit()
-        self._stats_tracker.track(frame.seq, frame.values)
         # Main thread (queued). Record raw, process edited; mark dirty for repaint.
         self._last_raw_frame = frame
         edited = Frame(seq=frame.seq, time=frame.time,
@@ -772,22 +797,11 @@ class SessionController(QObject):
         if self._recorder.is_recording:
             self._recorder.write(frame)   # always record raw values, never edited
         self._dirty = True
-        self.trendData.emit(json.dumps(self._stats_tracker.get_trend()))
 
         if self._last and self._last.stats:
             avg = self._last.stats.avg
-            now = time.monotonic()
-            self._trend_buffer.append(avg)
-            self._trend_timestamps.append(now)
-
-            # drop entries older than 60 secs
-            cutoff = now -60
-            while self._trend_timestamps and self._trend_timestamps[0] < cutoff:
-                self._trend_timestamps.pop(0)
-                self._trend_buffer.pop(0)
-
-
-
+            elapsed = time.monotonic() - self._stream_start_time
+            self.trendDelta.emit(json.dumps([[elapsed, avg]]))
 
     def _flush_repaint(self) -> None:
         if not self._dirty:
@@ -843,7 +857,8 @@ class SessionController(QObject):
         self._sensor_editor.clear()
         self._reprocess_current()
 
-    def _flush_trend(self) -> None:
-        import json
-        self.trendData.emit(json.dumps(self._trend_buffer))
+    def _reset_live_trend(self) -> None:
+        """Mark a fresh stream start for elapsed-time trend deltas."""
+        self._stream_start_time = time.monotonic()
+        self.trendReset.emit()
 

src/pygui/backend/data/file_browser.py

@@ -37,6 +37,16 @@ class FileBrowser(QObject):
         return str(self._current_directory)
 
     # ===== Directory Selection =====
+    @Slot(str)
+    def setCurrentDirectory(self, path: str) -> None:
+        """Point the browser at `path` without opening a native dialog.
+
+        Used to keep this directory in sync with DeviceController.saveDataDir
+        when the user picks a save folder elsewhere in the app.
+        """
+        self._set_current_directory(Path(path))
+        self._refresh_files(show_empty_message=False)
+
     @Slot()
     def chooseDirectory(self) -> None:
         selected_dir = QFileDialog.getExistingDirectory(

src/pygui/backend/models/frame_player.py

@@ -8,6 +8,19 @@ def frames_from_wafer_data(data: ZWaferData | None, records) -> list[Frame]:
     """Build Frames from parsed DataRecords (records = list[DataRecord].)"""
     return [Frame(seq=i, time=r.time, values=list(r.values)) for i, r in enumerate(records)]
 
+
+def all_sensor_series(frames: list[Frame]) -> tuple[list[str], list[list[float]]]:
+    """Per-sensor value series across every frame, for the whole-run Graph tab.
+
+    Sensor names are 1-based ("Sensor 1", ...), matching the C# original.
+    """
+    if not frames:
+        return [], []
+    n_sensors = len(frames[0].values)
+    names = [f"Sensor {i + 1}" for i in range(n_sensors)]
+    series = [[frame.values[i] for frame in frames] for i in range(n_sensors)]
+    return names, series
+
 class FramePlayer:
     def __init__(self) -> None:
         self._frames: list[Frame] =[]
@@ -22,6 +35,10 @@ class FramePlayer:
     def total(self) -> int:
         return len(self._frames)
 
+    @property
+    def frames(self) -> tuple[Frame, ...]:
+        return tuple(self._frames)
+
     @property
     def index(self) -> int:
         return self._i

src/pygui/backend/models/frame_stats.py

@@ -14,6 +14,44 @@ class Stats:
     sigma: float; three_sigma: float
 
 
+@dataclass(frozen=True)
+class EdgeCenterStats:
+    min_edge_index: int; min_center_index: int
+    min_edge: float; min_center: float; min_delta: float
+    max_edge_index: int; max_center_index: int
+    max_edge: float; max_center: float; max_delta: float
+
+
+def compute_edge_center(
+    values: list[float],
+    pairs: tuple[tuple[int, int], ...],
+    excluded: set[int],
+) -> EdgeCenterStats | None:
+    """Min/max |edge - center| over the family's pair table.
+
+    Pairs with an excluded (replaced) sensor, an index outside the frame, or a
+    NaN value are skipped. Returns None when no pair is computable.
+    """
+    n = len(values)
+    best: list[tuple[float, int, int]] = []
+    for e, c in pairs:
+        if e in excluded or c in excluded or e >= n or c >= n:
+            continue
+        if math.isnan(values[e]) or math.isnan(values[c]):
+            continue
+        best.append((abs(values[e] - values[c]), e, c))
+    if not best:
+        return None
+    min_d, min_e, min_c = min(best)
+    max_d, max_e, max_c = max(best)
+    return EdgeCenterStats(
+        min_edge_index=min_e, min_center_index=min_c,
+        min_edge=values[min_e], min_center=values[min_c], min_delta=min_d,
+        max_edge_index=max_e, max_center_index=max_c,
+        max_edge=values[max_e], max_center=values[max_c], max_delta=max_d,
+    )
+
+
 def compute_stats(values: list[float]) -> Stats:
     clean = [(i, v) for i, v in enumerate(values) if not math.isnan(v)]
     if not clean:

src/pygui/backend/models/sensor_editor.py

@@ -28,6 +28,11 @@ class SensorEditor:
     def has_overrides(self) -> bool:
         return bool(self._replacements or self._offsets)
 
+    def replaced_indices(self) -> set[int]:
+        """Sensors whose value is a replacement (offsets don't count — an
+        offset sensor still reads from its physical location)."""
+        return set(self._replacements)
+
     def active_indices(self) -> list[int]:
         """Return sorted sensor indices that have any override."""
         return sorted(set(self._replacements) | set(self._offsets))

src/pygui/backend/visualization/chart_geometry.py

@@ -31,3 +31,22 @@ def index_to_pixel(index: float, count: int, pixel_start: float, pixel_span: flo
         return pixel_start + pixel_span / 2
     fraction = index / (count - 1)
     return pixel_start + fraction * pixel_span
+
+
+def elapsed_to_pixel(
+    elapsed: float,
+    window_start: float,
+    window_end: float,
+    pixel_start: float,
+    pixel_span: float,
+) -> float:
+    """Map an elapsed-seconds value onto a pixel range, left to right.
+
+    Unlike `value_to_pixel`, this is not inverted: larger elapsed values sit
+    at larger pixel x-coordinates, matching how time flows left-to-right.
+    """
+    window_span = window_end - window_start
+    if window_span < 1e-9:
+        return pixel_start + pixel_span
+    fraction = (elapsed - window_start) / window_span
+    return pixel_start + fraction * pixel_span

src/pygui/backend/visualization/graph_quick_item.py

@@ -21,7 +21,9 @@ Usage from QML::
 
 from __future__ import annotations
 
-from PySide6.QtCore import Property, QRectF, Qt, Signal
+import math
+
+from PySide6.QtCore import Property, QRectF, Qt, Signal, Slot
 from PySide6.QtGui import QColor, QFont, QFontMetrics, QPainter, QPen
 from PySide6.QtQml import QmlElement
 from PySide6.QtQuick import QQuickPaintedItem
@@ -32,6 +34,47 @@ QML_IMPORT_NAME = "ISC.Wafer"
 QML_IMPORT_MAJOR_VERSION = 1
 
 
+def viewport_stats(
+    series: list[list[float]],
+    names: list[str],
+    start: int,
+    end: int,
+) -> tuple[float, float, float, str, str]:
+    """Aggregate min/max/avg across every sensor's points in `[start, end]`.
+
+    Mirrors PopupChartForm.cs's `recalc_stats`: one running min/max/avg over
+    every visible point from every series, plus which sensor achieved each
+    extreme. Non-numeric values are skipped. No points in range -> zeros and
+    empty sensor names.
+    """
+    vmin = math.inf
+    vmax = -math.inf
+    total = 0.0
+    count = 0
+    min_sensor = ""
+    max_sensor = ""
+    for i, s in enumerate(series):
+        name = names[i] if i < len(names) else ""
+        lo = max(0, start)
+        hi = min(len(s) - 1, end)
+        for j in range(lo, hi + 1):
+            try:
+                v = float(s[j])
+            except (TypeError, ValueError):
+                continue
+            if v < vmin:
+                vmin = v
+                min_sensor = name
+            if v > vmax:
+                vmax = v
+                max_sensor = name
+            total += v
+            count += 1
+    if count == 0:
+        return (0.0, 0.0, 0.0, "", "")
+    return (vmin, vmax, total / count, min_sensor, max_sensor)
+
+
 @QmlElement
 class GraphQuickItem(QQuickPaintedItem):
     """Painted line chart; driven by series data passed via QML property bindings."""
@@ -42,6 +85,8 @@ class GraphQuickItem(QQuickPaintedItem):
     xLabelChanged = Signal()
     yLabelChanged = Signal()
     colorsChanged = Signal()
+    viewportChanged = Signal()
+    viewStatsChanged = Signal()
 
     def __init__(self, parent=None) -> None:
         super().__init__(parent)
@@ -74,6 +119,18 @@ class GraphQuickItem(QQuickPaintedItem):
         self._max_y: float = 150.0
         self._padding: dict[str, int] = {"left": 60, "right": 20, "top": 30, "bottom": 50}
 
+        # Viewport (replay chart zoom/pan): defaults reproduce "whole series",
+        # so the Graph tab (which never sets these) is unaffected. See
+        # docs/adr/0004-graphquickitem-viewport-for-replay-chart.md.
+        self._view_start: int = 0
+        self._view_end: int = -1
+        self._show_min_max_markers: bool = False
+        self._view_min: float = 0.0
+        self._view_max: float = 0.0
+        self._view_avg: float = 0.0
+        self._view_min_sensor: str = ""
+        self._view_max_sensor: str = ""
+
     # ── Qt properties (QML-bindable) ──────────────────────────────────────────
 
     @Property("QVariantList", notify=seriesDataChanged)
@@ -83,7 +140,16 @@ class GraphQuickItem(QQuickPaintedItem):
     @seriesData.setter  # type: ignore[no-redef]
     def seriesData(self, val: list) -> None:
         self._series_data = [list(s) for s in (val or [])]
+        # New data resets the viewport to the full range -- matches
+        # PopupChartForm.cs's SetData(), which resets AxisX.Minimum/Maximum
+        # before RecalculateAxesScale(). Without this, a stale viewport left
+        # over from a previous (longer) series can point entirely past the
+        # new data -- every per-series slice becomes empty and the chart
+        # silently renders nothing instead of the new data.
+        self._view_start = 0
+        self._view_end = -1
         self._auto_range()
+        self._recompute_view_stats()
         self.seriesDataChanged.emit()
         self.update()
 
@@ -94,9 +160,130 @@ class GraphQuickItem(QQuickPaintedItem):
     @sensorNames.setter  # type: ignore[no-redef]
     def sensorNames(self, val: list) -> None:
         self._sensor_names = list(val or [])
+        self._recompute_view_stats()
         self.sensorNamesChanged.emit()
         self.update()
 
+    # ── Viewport properties (replay chart zoom/pan) ────────────────────────
+
+    @Property(int, notify=viewportChanged)
+    def viewStartIndex(self) -> int:
+        return self._view_start
+
+    @viewStartIndex.setter  # type: ignore[no-redef]
+    def viewStartIndex(self, val: int) -> None:
+        v = max(0, int(val))
+        if v == self._view_start:
+            return
+        self._view_start = v
+        self._on_viewport_changed()
+
+    @Property(int, notify=viewportChanged)
+    def viewEndIndex(self) -> int:
+        return self._view_end
+
+    @viewEndIndex.setter  # type: ignore[no-redef]
+    def viewEndIndex(self, val: int) -> None:
+        v = int(val)
+        if v == self._view_end:
+            return
+        self._view_end = v
+        self._on_viewport_changed()
+
+    @Property(bool, notify=viewportChanged)
+    def showMinMaxMarkers(self) -> bool:
+        return self._show_min_max_markers
+
+    @showMinMaxMarkers.setter  # type: ignore[no-redef]
+    def showMinMaxMarkers(self, val: bool) -> None:
+        v = bool(val)
+        if v == self._show_min_max_markers:
+            return
+        self._show_min_max_markers = v
+        self.viewportChanged.emit()
+        self.update()
+
+    @Property(float, notify=viewStatsChanged)
+    def viewMin(self) -> float:
+        return self._view_min
+
+    @Property(float, notify=viewStatsChanged)
+    def viewMax(self) -> float:
+        return self._view_max
+
+    @Property(float, notify=viewStatsChanged)
+    def viewAvg(self) -> float:
+        return self._view_avg
+
+    @Property(str, notify=viewStatsChanged)
+    def viewMinSensor(self) -> str:
+        return self._view_min_sensor
+
+    @Property(str, notify=viewStatsChanged)
+    def viewMaxSensor(self) -> str:
+        return self._view_max_sensor
+
+    # ── Zoom/pan slots (replay chart interaction; QML MouseArea calls these
+    #    with fractions derived from wheel/drag pixel deltas) ───────────────
+
+    @Slot(float, float)
+    def zoomAtFraction(self, frac: float, factor: float) -> None:
+        """Zoom the viewport around a fractional X position within it.
+
+        `frac` in [0, 1] is where within the current viewport to zoom around;
+        `factor < 1` narrows the window (zoom in), `factor > 1` widens it
+        (zoom out). Clamped to data bounds and a minimum 1-index window.
+        """
+        max_len = max((len(s) for s in self._series_data), default=0)
+        if max_len < 2:
+            return
+        start = float(self._view_start)
+        end = float(self._resolved_view_end())
+        width = max(1.0, end - start)
+        f = max(0.0, min(1.0, frac))
+        center = start + f * width
+        new_width = max(1.0, min(float(max_len - 1), width * max(0.01, factor)))
+        new_start = center - f * new_width
+        new_end = new_start + new_width
+        self._set_viewport_clamped(new_start, new_end, max_len)
+
+    @Slot(float)
+    def panByFraction(self, delta_frac: float) -> None:
+        """Shift the viewport by `delta_frac * window_width` indices."""
+        max_len = max((len(s) for s in self._series_data), default=0)
+        if max_len < 2:
+            return
+        start = float(self._view_start)
+        end = float(self._resolved_view_end())
+        width = max(1.0, end - start)
+        shift = delta_frac * width
+        self._set_viewport_clamped(start + shift, end + shift, max_len)
+
+    @Slot()
+    def resetZoom(self) -> None:
+        """Restore the full-range viewport sentinel (0, -1)."""
+        self._set_viewport(0, -1)
+
+    def _set_viewport_clamped(self, new_start: float, new_end: float, max_len: int) -> None:
+        if new_start < 0.0:
+            new_end -= new_start
+            new_start = 0.0
+        if new_end > max_len - 1:
+            new_start -= new_end - (max_len - 1)
+            new_end = float(max_len - 1)
+        new_start = max(0.0, new_start)
+        self._set_viewport(int(round(new_start)), int(round(new_end)))
+
+    def _set_viewport(self, start: int, end: int) -> None:
+        """Set the viewport bounds directly (not through the QML-facing
+        property setters, so this stays a plain attribute write for mypy)."""
+        new_start = max(0, start)
+        if new_start == self._view_start and end == self._view_end:
+            return
+        self._view_start = new_start
+        self._view_end = end
+        self._on_viewport_changed()
+
     @Property(str, notify=titleChanged)
     def title(self) -> str:
         return self._title
@@ -194,13 +381,38 @@ class GraphQuickItem(QQuickPaintedItem):
 
     # ── internal ──────────────────────────────────────────────────────────────
 
+    def _resolved_view_end(self) -> int:
+        """`viewEndIndex` with the -1 ("last index") sentinel resolved."""
+        max_len = max((len(s) for s in self._series_data), default=0)
+        if self._view_end < 0 or self._view_end > max_len - 1:
+            return max_len - 1
+        return self._view_end
+
+    def _on_viewport_changed(self) -> None:
+        self._auto_range()
+        self._recompute_view_stats()
+        self.viewportChanged.emit()
+        self.update()
+
+    def _recompute_view_stats(self) -> None:
+        end = self._resolved_view_end()
+        vmin, vmax, avg, min_sensor, max_sensor = viewport_stats(
+            self._series_data, self._sensor_names, self._view_start, end
+        )
+        self._view_min, self._view_max, self._view_avg = vmin, vmax, avg
+        self._view_min_sensor, self._view_max_sensor = min_sensor, max_sensor
+        self.viewStatsChanged.emit()
+
     def _auto_range(self) -> None:
-        """Set Y range to cover all data with 10% padding."""
+        """Set Y range to cover the current viewport's data with 10% padding."""
+        start = max(0, self._view_start)
+        end = self._resolved_view_end()
         all_vals: list[float] = []
         for series in self._series_data:
-            for v in series:
+            hi = min(len(series) - 1, end)
+            for i in range(start, hi + 1):
                 try:
-                    all_vals.append(float(v))
+                    all_vals.append(float(series[i]))
                 except (ValueError, TypeError):
                     pass
         if not all_vals:
@@ -319,18 +531,23 @@ class GraphQuickItem(QQuickPaintedItem):
                 self._x_label,
             )
 
-        # --- X-axis ticks ---
-        num_points = max(len(s) for s in self._series_data) if self._series_data else 0
-        if num_points > 1:
-            n_x_ticks = min(num_points, max(2, int(plot_w // 80)))
-            x_tick_step = (num_points - 1) / max(1, n_x_ticks - 1)
+        # --- Viewport slice (replay chart zoom/pan; full range by default,
+        #     so unset viewport reproduces the pre-viewport rendering) ---
+        view_start = max(0, self._view_start)
+        view_end = self._resolved_view_end()
+        view_len = max(1, view_end - view_start + 1)
+
+        # --- X-axis ticks (labelled in original, non-sliced index space) ---
+        if view_len > 1:
+            n_x_ticks = min(view_len, max(2, int(plot_w // 80)))
+            x_tick_step = (view_len - 1) / max(1, n_x_ticks - 1)
             for i in range(n_x_ticks):
-                idx = int(round(i * x_tick_step))
-                x_px = index_to_pixel(idx, num_points, plot_left, plot_w)
+                rel_idx = int(round(i * x_tick_step))
+                x_px = index_to_pixel(rel_idx, view_len, plot_left, plot_w)
                 painter.setPen(axis_pen)
                 painter.drawText(
                     int(x_px - 12), int(plot_top + plot_h + 14),
-                    str(idx + 1),
+                    str(view_start + rel_idx + 1),
                 )
 
         # --- Axes boundary ---
@@ -339,28 +556,36 @@ class GraphQuickItem(QQuickPaintedItem):
         painter.drawLine(int(plot_left), int(plot_top), int(plot_left), int(plot_top + plot_h))
         painter.drawLine(int(plot_left), int(plot_top + plot_h), int(plot_left + plot_w), int(plot_top + plot_h))
 
-        # --- Figure out max series length ---
-        max_len = max(len(s) for s in self._series_data) if self._series_data else 0
-        if max_len < 1:
-            return
-
-        # --- Draw each series ---
+        # --- Draw each series (sliced to the current viewport) ---
+        min_pt: tuple[float, float] | None = None
+        max_pt: tuple[float, float] | None = None
+        min_seen = math.inf
+        max_seen = -math.inf
         for si, series in enumerate(self._series_data):
-            if len(series) < 1:
+            hi = min(len(series) - 1, view_end)
+            sliced = series[view_start:hi + 1] if view_start <= hi else []
+            if not sliced:
                 continue
             color = self._series_colors[si % len(self._series_colors)]
             pen = QPen(color, 2)
             painter.setPen(pen)
 
             pts: list[tuple[float, float]] = []
-            for i, val in enumerate(series):
+            for i, val in enumerate(sliced):
                 try:
                     v = float(val)
                 except (ValueError, TypeError):
                     continue
-                x_px = index_to_pixel(i, max_len, plot_left, plot_w)
+                x_px = index_to_pixel(i, view_len, plot_left, plot_w)
                 y_px = value_to_pixel(v, self._min_y, self._max_y, plot_top, plot_h)
                 pts.append((x_px, y_px))
+                if self._show_min_max_markers:
+                    if v < min_seen:
+                        min_seen = v
+                        min_pt = (x_px, y_px)
+                    if v > max_seen:
+                        max_seen = v
+                        max_pt = (x_px, y_px)
 
             if len(pts) < 2:
                 if len(pts) == 1:
@@ -373,6 +598,19 @@ class GraphQuickItem(QQuickPaintedItem):
                     int(pts[i + 1][0]), int(pts[i + 1][1]),
                 )
 
+        # --- Min/max markers (replay chart only; PopupChartForm.cs parity) ---
+        if self._show_min_max_markers:
+            marker_font = QFont()
+            marker_font.setPixelSize(14)
+            marker_font.setBold(True)
+            painter.setFont(marker_font)
+            if max_pt is not None:
+                painter.setPen(QPen(QColor("#FF5757")))
+                painter.drawText(int(max_pt[0] - 6), int(max_pt[1] - 8), "▼")
+            if min_pt is not None:
+                painter.setPen(QPen(QColor("#42A5F5")))
+                painter.drawText(int(min_pt[0] - 6), int(min_pt[1] + 18), "▲")
+
         # --- Legend ---
         if self._show_legend and self._sensor_names:
             legend_font = QFont()

src/pygui/backend/visualization/trend_chart_item.py

@@ -1,18 +1,20 @@
 """QQuickPaintedItem trend chart — running-average temperature over time.
 
-Renders a single polyline series (per-frame average temperatures) using QPainter.
-Mirrors the @QmlElement registration pattern used by `WaferMapItem` so it can
-be embedded directly in QML via `import ISC.Wafer` and used as `TrendChartItem { }`.
+Renders a single polyline series (per-frame average temperatures) over a fixed
+0-200°C Y axis and an elapsed-seconds X axis, using a bounded 60-second
+rolling window. Mirrors the @QmlElement registration pattern used by
+`WaferMapItem` so it can be embedded directly in QML via `import ISC.Wafer`
+and used as `TrendChartItem { }`.
 
-The series is driven by the existing `streamController.trendData` signal, which
-emits a JSON-encoded list of floats from both review-mode replay and live-mode
-streaming.
+The series is driven by `streamController.trendDelta` (one new
+`[elapsed_s, value]` point per live frame) and cleared on
+`streamController.trendReset` (new stream started). See
+docs/adr/0001-trend-chart-axes-standardization.md.
 """
 from __future__ import annotations
 
 import json
 import logging
-import math
 from typing import Optional
 
 from PySide6.QtCore import Property, QPoint, QRectF, Qt, Signal, Slot
@@ -20,19 +22,23 @@ from PySide6.QtGui import QColor, QFont, QPainter, QPen, QPolygon
 from PySide6.QtQml import QmlElement
 from PySide6.QtQuick import QQuickPaintedItem
 
-from pygui.backend.visualization.chart_geometry import index_to_pixel, value_to_pixel
+from pygui.backend.visualization.chart_geometry import elapsed_to_pixel, value_to_pixel
 
 log = logging.getLogger(__name__)
 
 QML_IMPORT_NAME = "ISC.Wafer"
 QML_IMPORT_MAJOR_VERSION = 1
 
+WINDOW_SECONDS = 60.0
+Y_MIN = 0.0
+Y_MAX = 200.0
+Y_TICKS = (0, 40, 80, 120, 160, 200)
+
 
 @QmlElement
 class TrendChartItem(QQuickPaintedItem):
-    """Painted trend chart; driven by a list of floats via the `data` property."""
+    """Painted trend chart; driven by incremental (elapsed_s, value) points."""
 
-    dataChanged = Signal()
     hasDataChanged = Signal()
     lineColorChanged = Signal()
     gridColorChanged = Signal()
@@ -45,40 +51,29 @@ class TrendChartItem(QQuickPaintedItem):
         self.setAntialiasing(True)
         self.setFillColor(QColor("transparent"))
 
-        self._data: list[float] = []
+        self._points: list[tuple[float, float]] = []
         self._padding: int = 8
         # Separate from `_padding` (breathing room around the plot area): these
         # reserve space for the axis labels themselves, which are wider than
         # `_padding` alone — that mismatch is what clipped y-axis text before.
-        self._margin_left: int = 34
-        self._margin_bottom: int = 16
+        self._margin_left: int = 48
+        self._margin_bottom: int = 30
+        # Top tick label is drawn centered on the plot's top edge (y_px - 7),
+        # so the plot needs headroom or the label kisses the card border.
+        self._margin_top: int = 10
         self._line_color = QColor("#5B9DF5")
         self._grid_color = QColor("#2A3441")
         self._text_color = QColor("#CBD5E1")
 
     # ── Qt properties ─────────────────────────────────────────────────────
 
-    @Property("QVariantList", notify=dataChanged)
-    def data(self) -> list[float]:
-        return self._data
-
-    @data.setter  # type: ignore[no-redef]
-    def data(self, val) -> None:
-        coerced = self._coerce_floats(val)
-        if coerced == self._data:
-            return
-        self._data = coerced
-        self.dataChanged.emit()
-        self.hasDataChanged.emit()
-        self.update()
-
     @Property(bool, notify=hasDataChanged)
     def hasData(self) -> bool:
-        """True when the data list has at least one point.
+        """True when at least one point is buffered.
 
-        QML can bind to this safely (QVariantList `.length` is not bindable).
+        QML can bind to this safely (a plain list length is not bindable).
         """
-        return len(self._data) > 0
+        return len(self._points) > 0
 
     @Property(QColor, notify=lineColorChanged)
     def lineColor(self) -> QColor:
@@ -129,24 +124,48 @@ class TrendChartItem(QQuickPaintedItem):
         self.paddingChanged.emit()
         self.update()
 
-    # ── Convenience slot for QML: accept a JSON string from a Signal(str) ──
+    # ── slots for QML: streamController.trendDelta / trendReset ────────────
 
     @Slot(str)
-    def setDataFromJson(self, avgs_json: str) -> None:
-        """Slot for QML Connections handler: parse JSON array and update data.
+    def appendDelta(self, delta_json: str) -> None:
+        """Append new (elapsed_s, value) points and prune the 60s window.
 
-        Mirrors `streamController.trendData` (which emits JSON-encoded floats).
+        Mirrors `streamController.trendDelta`, which emits one new pair per
+        live frame as `[[elapsed_s, value], ...]`.
         """
         try:
-            parsed = json.loads(avgs_json) if avgs_json else []
+            parsed = json.loads(delta_json) if delta_json else []
         except (json.JSONDecodeError, TypeError) as exc:
-            log.error("TrendChartItem: failed to parse trend JSON: %s", exc)
+            log.error("TrendChartItem: failed to parse trend delta JSON: %s", exc)
             return
-        coerced = self._coerce_floats(parsed)
-        if coerced == self._data:
+
+        had_data = len(self._points) > 0
+        added = False
+        for pair in parsed:
+            try:
+                elapsed, value = float(pair[0]), float(pair[1])
+            except (TypeError, ValueError, IndexError):
+                continue
+            self._points.append((elapsed, value))
+            added = True
+
+        if not added:
             return
-        self._data = coerced
-        self.dataChanged.emit()
+
+        latest_elapsed = self._points[-1][0]
+        cutoff = latest_elapsed - WINDOW_SECONDS
+        self._points = [p for p in self._points if p[0] >= cutoff]
+
+        if not had_data:
+            self.hasDataChanged.emit()
+        self.update()
+
+    @Slot()
+    def clearTrend(self) -> None:
+        """Clear all buffered points (new stream started)."""
+        if not self._points:
+            return
+        self._points = []
         self.hasDataChanged.emit()
         self.update()
 
@@ -162,58 +181,38 @@ class TrendChartItem(QQuickPaintedItem):
             return
 
         left = self._padding + self._margin_left
+        top = self._padding + self._margin_top
         bottom_inset = self._padding + self._margin_bottom
-        plot_rect = QRectF(left, self._padding,
+        plot_rect = QRectF(left, top,
                            max(1, w - left - self._padding),
-                           max(1, h - self._padding - bottom_inset))
+                           max(1, h - top - bottom_inset))
 
         self._draw_grid(painter, plot_rect)
 
-        if len(self._data) < 2:
+        if len(self._points) < 2:
             return
 
-        y_min, y_max = self._y_range()
-        self._draw_axes_labels(painter, plot_rect, y_min, y_max)
-        self._draw_line(painter, plot_rect, y_min, y_max)
+        window_end = self._points[-1][0]
+        window_start = max(0.0, window_end - WINDOW_SECONDS)
+        self._draw_axes_labels(painter, plot_rect, window_start, window_end)
+        self._draw_line(painter, plot_rect, window_start, window_end)
 
     # ── internals ─────────────────────────────────────────────────────────
 
-    def _coerce_floats(self, val) -> list[float]:
-        if not val:
-            return []
-        out: list[float] = []
-        for v in val:
-            try:
-                out.append(float(v))
-            except (TypeError, ValueError):
-                continue
-        return out
+    def _x_to_px(self, elapsed: float, window_start: float, window_end: float, plot_rect: QRectF) -> float:
+        return elapsed_to_pixel(elapsed, window_start, window_end, plot_rect.left(), plot_rect.width())
 
-    def _y_range(self) -> tuple[float, float]:
-        lo = min(self._data)
-        hi = max(self._data)
-        if hi - lo < 1e-9:
-            lo, hi = lo - 5.0, hi + 5.0
-        # Snap to a "nice" tick step (1/2/5 × 10^k) so the axis holds still
-        # while streaming and only moves when data crosses a step boundary —
-        # raw min/max rescaled every frame, which read as an unstable chart.
-        raw_step = (hi - lo) / 4
-        mag = 10 ** math.floor(math.log10(raw_step))
-        step = next(s * mag for s in (1, 2, 5, 10) if s * mag >= raw_step)
-        return math.floor(lo / step) * step, math.ceil(hi / step) * step
-
-    def _x_to_px(self, i: int, n: int, plot_rect: QRectF) -> float:
-        return index_to_pixel(i, n, plot_rect.left(), plot_rect.width())
-
-    def _y_to_px(self, v: float, y_min: float, y_max: float, plot_rect: QRectF) -> float:
-        return value_to_pixel(v, y_min, y_max, plot_rect.top(), plot_rect.height())
+    def _y_to_px(self, value: float, plot_rect: QRectF) -> float:
+        px = value_to_pixel(value, Y_MIN, Y_MAX, plot_rect.top(), plot_rect.height())
+        # Clamp: a sensor reading outside 0-200°C shouldn't paint outside the widget.
+        return max(plot_rect.top(), min(plot_rect.bottom(), px))
 
     def _draw_grid(self, painter: QPainter, plot_rect: QRectF) -> None:
         pen = QPen(self._grid_color)
         pen.setWidthF(1.0)
         pen.setCosmetic(True)
         painter.setPen(pen)
-        rows = 4
+        rows = len(Y_TICKS) - 1
         for i in range(rows + 1):
             y = plot_rect.top() + (i / rows) * plot_rect.height()
             painter.drawLine(int(plot_rect.left()), int(y),
@@ -223,36 +222,29 @@ class TrendChartItem(QQuickPaintedItem):
         self,
         painter: QPainter,
         plot_rect: QRectF,
-        y_min: float,
-        y_max: float,
+        window_start: float,
+        window_end: float,
     ) -> None:
         painter.setPen(self._text_color)
         font = QFont(painter.font())
         font.setPointSizeF(max(7.0, font.pointSizeF() * 0.85))
         painter.setFont(font)
 
-        rows = 4
-        label_w = self._margin_left - 4  # 4px gutter before the plot area
-        for i in range(rows + 1):
-            t = i / rows
-            y_val = y_max - t * (y_max - y_min)
-            y_px = plot_rect.top() + t * plot_rect.height()
-            label = f"{y_val:g}"
-            painter.drawText(QRectF(0, y_px - 7, label_w, 14),
+        title_w = 14  # leftmost sliver reserved for the rotated "Temp" title
+        label_w = self._margin_left - 4 - title_w  # 4px gutter before the plot area
+        for tick in reversed(Y_TICKS):
+            y_px = self._y_to_px(tick, plot_rect)
+            painter.drawText(QRectF(title_w, y_px - 7, label_w, 14),
                              Qt.AlignmentFlag.AlignRight | Qt.AlignmentFlag.AlignVCenter,
-                             label)
+                             str(tick))
 
-        # X-axis: sample index. `trendData` carries plain averages with no
-        # timestamps attached, so index is the only x-coordinate available —
-        # it reads correctly for review mode (index == frame number) and as a
-        # relative recency order for the live rolling window. paint() already
-        # guarantees len(self._data) >= 2 before calling this.
-        n = len(self._data)
-        cols = min(4, n - 1)
+        # X-axis: elapsed seconds within the current rolling window.
+        cols = 4
         y_px = plot_rect.bottom() + 4
         for i in range(cols + 1):
-            idx = round((i / cols) * (n - 1))
-            x_px = self._x_to_px(idx, n, plot_rect)
+            t_val = window_start + (i / cols) * (window_end - window_start)
+            x_px = self._x_to_px(t_val, window_start, window_end, plot_rect)
+            label = f"{t_val:.0f}"
             if i == 0:
                 rect = QRectF(x_px, y_px, 40, 14)
                 align = Qt.AlignmentFlag.AlignLeft
@@ -263,16 +255,36 @@ class TrendChartItem(QQuickPaintedItem):
             else:
                 rect = QRectF(x_px - 20, y_px, 40, 14)
                 align = Qt.AlignmentFlag.AlignHCenter
-            painter.drawText(rect, align | Qt.AlignmentFlag.AlignTop, str(idx))
+            painter.drawText(rect, align | Qt.AlignmentFlag.AlignTop, label)
+
+        self._draw_axis_titles(painter, plot_rect, title_w, y_px + 18)
+
+    def _draw_axis_titles(
+        self,
+        painter: QPainter,
+        plot_rect: QRectF,
+        title_w: float,
+        x_label_bottom: float,
+    ) -> None:
+        # Y axis: "Temp", rotated upright, centered along the plot's height.
+        painter.save()
+        painter.translate(title_w / 2, plot_rect.center().y())
+        painter.rotate(-90)
+        painter.drawText(QRectF(-plot_rect.height() / 2, -7, plot_rect.height(), 14),
+                         Qt.AlignmentFlag.AlignCenter, "Temp (°C)")
+        painter.restore()
+
+        # X axis: "Time", centered under the elapsed-seconds tick row.
+        painter.drawText(QRectF(plot_rect.left(), x_label_bottom, plot_rect.width(), 14),
+                         Qt.AlignmentFlag.AlignHCenter | Qt.AlignmentFlag.AlignTop, "Time")
 
     def _draw_line(
         self,
         painter: QPainter,
         plot_rect: QRectF,
-        y_min: float,
-        y_max: float,
+        window_start: float,
+        window_end: float,
     ) -> None:
-        n = len(self._data)
         pen = QPen(self._line_color)
         pen.setWidthF(2.0)
         pen.setCosmetic(True)
@@ -281,15 +293,16 @@ class TrendChartItem(QQuickPaintedItem):
         painter.setPen(pen)
 
         poly = QPolygon()
-        for i, v in enumerate(self._data):
-            px = self._x_to_px(i, n, plot_rect)
-            py = self._y_to_px(v, y_min, y_max, plot_rect)
+        for elapsed, value in self._points:
+            px = self._x_to_px(elapsed, window_start, window_end, plot_rect)
+            py = self._y_to_px(value, plot_rect)
             poly.append(QPoint(int(px), int(py)))
         painter.drawPolyline(poly)
 
         # Trailing dot at the last data point
-        last_x = int(self._x_to_px(n - 1, n, plot_rect))
-        last_y = int(self._y_to_px(self._data[-1], y_min, y_max, plot_rect))
+        last_elapsed, last_value = self._points[-1]
+        last_x = int(self._x_to_px(last_elapsed, window_start, window_end, plot_rect))
+        last_y = int(self._y_to_px(last_value, plot_rect))
         painter.setBrush(self._line_color)
         painter.setPen(Qt.PenStyle.NoPen)
         radius = 3

src/pygui/backend/visualization/wafer_map_item.py

@@ -14,7 +14,7 @@ import logging
 import math
 
 import numpy as np
-from PySide6.QtCore import Property, QPoint, Qt, Signal, Slot
+from PySide6.QtCore import Property, QPoint, QRectF, Qt, Signal, Slot
 from PySide6.QtGui import (
     QBrush,
     QColor,
@@ -27,6 +27,7 @@ from PySide6.QtGui import (
 from PySide6.QtQml import QmlElement
 from PySide6.QtQuick import QQuickPaintedItem
 
+from pygui.backend.models.frame_stats import compute_stats
 from pygui.backend.visualization.rbf_heatmap import (
     ellipse_alpha,
     interpolate_field,
@@ -36,6 +37,59 @@ from pygui.backend.wafer.zwafer_models import Sensor
 
 log = logging.getLogger(__name__)
 
+
+def parse_thickness_csv(file_path: str) -> tuple[list[list[float]], str]:
+    """Parse a customer thickness CSV into [x, y, t2] points (mm from center).
+
+    Expected columns (C# parity): Lot Start Time, RC, Site#, Slot#, T2,
+    NGOF, Wafer X, Wafer Y. Only the first wafer (first Slot# value) is read.
+    Returns (points, error) — error is "" on success.
+    """
+    import csv
+
+    points: list[list[float]] = []
+    slot: str | None = None
+    try:
+        with open(file_path, newline="") as fh:
+            reader = csv.reader(fh)
+            header = next(reader, None)
+            if header is None:
+                return [], "Unable to read header row from CSV file."
+            if header and header[-1] == "":  # trailing comma
+                header = header[:-1]
+            nfields = len(header)
+            if nfields != 8:
+                return [], "Incorrect field count in CSV header row."
+            for lno, row in enumerate(reader, start=2):
+                if row and row[-1] == "":
+                    row = row[:-1]
+                if len(row) != nfields:
+                    return [], f"Incorrect field count in CSV row {lno}"
+                if slot is None:
+                    slot = row[3]
+                elif row[3] != slot:
+                    break
+                try:
+                    t2, x, y = float(row[4]), float(row[6]), float(row[7])
+                except ValueError:
+                    return [], f"Malformed value in CSV row {lno}"
+                points.append([x, y, t2])
+    except OSError as exc:
+        return [], f"Unable to read CSV file: {exc}"
+    if not points:
+        return [], "No data found in CSV file."
+    return points, ""
+
+
+def readout_text(values: list[float]) -> str:
+    """Full READOUT stats line for the export footer; '' when no data."""
+    if not values:
+        return ""
+    s = compute_stats(values)
+    return (f"Sensors: {len(values)}   Min: {s.min:.2f}°C (#{s.min_index + 1})   "
+            f"Max: {s.max:.2f}°C (#{s.max_index + 1})   Diff: {s.diff:.2f}   "
+            f"Avg: {s.avg:.2f}   σ: {s.sigma:.2f}   3σ: {s.three_sigma:.2f}")
+
 QML_IMPORT_NAME = "ISC.Wafer"
 QML_IMPORT_MAJOR_VERSION = 1
 
@@ -51,6 +105,7 @@ class WaferMapItem(QQuickPaintedItem):
     marginChanged   = Signal()
     blendChanged    = Signal()
     showLabelsChanged = Signal()
+    showExtremesChanged = Signal()
     colorsChanged   = Signal()
     shapeChanged    = Signal()
     sizeChanged     = Signal()
@@ -69,9 +124,10 @@ class WaferMapItem(QQuickPaintedItem):
         self._margin:   float = 1.0
         self._blend:    float = 0.0
         self._show_labels: bool = True
+        self._show_extremes: bool = True
         self._shape: str = "round"
         self._size: float = 300.0
-        self._thickness_data: list[float] = []
+        self._thickness_data: list[list[float]] = []  # [x_mm, y_mm, t2] triples
         self._show_thickness: bool = False
         self._thickness_heatmap:QImage | None = None
         # Hover highlight: index of the marker under the pointer (-1 = none)
@@ -188,6 +244,16 @@ class WaferMapItem(QQuickPaintedItem):
         self.showLabelsChanged.emit()
         self.update()
 
+    @Property(bool, notify=showExtremesChanged)
+    def showExtremes(self) -> bool:
+        return self._show_extremes
+
+    @showExtremes.setter  # type: ignore[no-redef]
+    def showExtremes(self, val: bool) -> None:
+        self._show_extremes = bool(val)
+        self.showExtremesChanged.emit()
+        self.update()
+
     @Property(str, notify=shapeChanged)
     def shape(self) -> str:
         return self._shape
@@ -210,13 +276,31 @@ class WaferMapItem(QQuickPaintedItem):
 
     @Property("QVariantList", notify=thicknessChanged)
     def thicknessData(self) -> list:
+        """Thickness measurement points as [x_mm, y_mm, t2] triples."""
         return self._thickness_data
 
     @thicknessData.setter  # type: ignore[no-redef]
     def thicknessData(self, val:list) -> None:
-        self._thickness_data = list(val or [])
+        self._thickness_data = [list(p) for p in (val or [])]
         self._rebuild_thickness()
         self.thicknessChanged.emit()
+        self.update()
+
+    @Property(bool, notify=thicknessChanged)
+    def hasThickness(self) -> bool:
+        return bool(self._thickness_data)
+
+    @Slot(str, result=str)
+    def loadThickness(self, file_path: str) -> str:
+        """Load a customer thickness CSV; returns error message, '' on success."""
+        points, err = parse_thickness_csv(file_path)
+        if err:
+            return err
+        self._thickness_data = points
+        self._rebuild_thickness()
+        self.thicknessChanged.emit()
+        self.update()
+        return ""
         self.update
 
     @Property(bool, notify=showThicknessChanged)
@@ -301,41 +385,73 @@ class WaferMapItem(QQuickPaintedItem):
     #   chosen output dir, plus an optional summary CSV of (file, min/max/mean).
     #   No new rendering code needed — see docs/pending/alpha-release-polish-plan.md §6.1.
     @Slot(str, result=bool)
-    def export_image(self, file_path: str) -> bool:
+    @Slot(str, str, result=bool)
+    def export_image(self, file_path: str, extra: str = "") -> bool:
         """Export the current wafer map rendering to a PNG file
 
         Args:
-            file_pat: Absolute path for the output PNG.
+            file_path: Absolute path for the output PNG.
+            extra: Optional second footer line (live stream metrics).
 
         Returns:
         True on success, False on failure
         """
-        if not file_path:
+        if not file_path or not self._values:
+            # No file loaded / no stream played yet — only the empty template
+            # would render, which isn't a meaningful export.
             return False
         try:
-            result = self.grabToImage()
-            img = result.image()  # type: ignore[attr-defined]
-            img.save(file_path, "PNG")
-            return True
+            # Render synchronously via paint() into our own image —
+            # grabToImage() resolves on a later render frame, so its result
+            # is null when read immediately (the old silent failure).
+            w, h = int(self.width()), int(self.height())
+            if w <= 0 or h <= 0:
+                return False
+            lines = [ln for ln in (readout_text(self._values), extra) if ln]
+            footer_h = 28 * len(lines)
+            img = QImage(w, h + footer_h, QImage.Format.Format_ARGB32)
+            img.fill(0)  # transparent background
+            painter = QPainter(img)
+            self.paint(painter)
+            if lines:
+                painter.fillRect(QRectF(0, h, w, footer_h), QColor("#101014"))
+                painter.setPen(QColor("#CBD5E1"))
+                for i, line in enumerate(lines):
+                    painter.drawText(QRectF(0, h + 28 * i, w, 28),
+                                     Qt.AlignmentFlag.AlignCenter, line)
+            painter.end()
+            return bool(img.save(file_path))
         except Exception as e:
             log.error("Export failed: %s", e)
             return False
 
+
     # ── internal ─────────────────────────────────────────────────────────
 
+    def _paint_extremes(self, painter: QPainter) -> None:
+        """Ring the hottest (high color) and coldest (low color) markers."""
+        if not self._show_extremes or not self._values or not self._markers:
+            return
+        s = compute_stats(self._values)
+        ring_r = self._marker_r + 5
+        painter.setBrush(Qt.BrushStyle.NoBrush)
+        for idx, color in ((s.max_index, self._high_color),
+                           (s.min_index, self._low_color)):
+            if idx not in self._markers:
+                continue
+            px, py = self._markers[idx]
+            painter.setPen(QPen(color, 2))
+            painter.drawEllipse(px - ring_r, py - ring_r, 2 * ring_r, 2 * ring_r)
+
     def _rebuild_thickness(self) -> None:
-        """Interpolate thickness data into a gray/orange heatmap QImage."""
-        if not self._sensors or not self._thickness_data:
+        """Interpolate thickness points into a gray/orange heatmap QImage."""
+        if not self._thickness_data:
             self._thickness_heatmap = None
             return
         ds = self._draw_size()
         r_mm = self._wafer_radius_mm()
-        xs = np.array([s.x for s in self._sensors])
-        ys = np.array([s.y for s in self._sensors])
-        vs = np.array(self._thickness_data[:len(self._sensors)], dtype=float)
-        if len(vs) < len(self._sensors):
-            self._thickness_heatmap = None
-            return
+        pts = np.array(self._thickness_data, dtype=float)
+        xs, ys, vs = pts[:, 0], pts[:, 1], pts[:, 2]
         try:
             # No round_clip — see _rebuild_heatmap for why the mask is analytic.
             field = interpolate_field(
@@ -554,6 +670,7 @@ class WaferMapItem(QQuickPaintedItem):
             painter.setOpacity(1.0)
 
         self._paint_markers(painter)
+        self._paint_extremes(painter)
 
     def _paint_template(self, painter: QPainter, cx: int, cy: int, r_px: int) -> None:
         ds = self._draw_size()

src/pygui/backend/wafer/wafer_layouts.py

@@ -70,12 +70,35 @@ def _load_yaml(path: Path) -> dict:
         return loaded
 
 
-# TODO P6.3: expose this list to a new LayoutSelector.qml (4-button chooser)
-#   THINKING: this already returns everything the UI needs (family names) —
-#   the missing piece is a context-property exposure (SessionController or a
-#   thin new property) and a setLayout(family) slot that calls load_layout()
-#   below. No parsing work needed; this is a wiring-only task.
-#   See docs/pending/alpha-release-polish-plan.md §6.3.
+# Edge→center sensor pair tables, ported verbatim from the C# original
+# (Form1.cs ec_map_*). Indices are 0-origin. Domain data, not derivable from
+# ring geometry — see docs/adr/0002-edge-center-pair-tables.md.
+_EC_MAPS: dict[str, tuple[tuple[int, int], ...]] = {
+    "AEP": tuple((e, 40 + e // 2) for e in range(16)),
+    "BCD": tuple((e, 28) for e in range(12)),
+    "F": ((0, 18), (1, 19), (2, 19), (3, 19), (4, 20), (5, 20),
+          (6, 20), (7, 21), (8, 21), (9, 21), (10, 18), (11, 18)),
+    "X": ((5, 76), (0, 76), (39, 76), (6, 77), (11, 77), (16, 77),
+          (17, 78), (22, 78), (27, 78), (28, 79), (33, 79), (38, 79)),
+    "Z": tuple((e, 0) for e in range(49, 65)),
+}
+
+
+def ec_pairs_for_wafer_id(wafer_id: str) -> tuple[tuple[int, int], ...]:
+    """Edge-center pairs for a wafer id's family letter; empty if unknown.
+
+    Unknown families deliberately get no pairs (C# fell through to Z).
+    """
+    prefix = wafer_id[0].upper() if wafer_id else ""
+    for families, key in (("AEP", "AEP"), ("BCD", "BCD"), ("F", "F"),
+                          ("X", "X"), ("Z", "Z")):
+        if prefix and prefix in families:
+            return _EC_MAPS[key]
+    return ()
+
+
+# P6.3 (LayoutSelector) dropped 2026-07-10 — the C# "layout" buttons only
+# exported coordinate spreadsheets, decided obsolete. See MIGRATION.md.
 def available_families() -> list[str]:
     return [_family_name(_load_yaml(p)["name"]) for p in _LAYOUTS_DIR.glob("*.yaml")]
 

src/pygui/serialcomm/data_parser.py

@@ -107,6 +107,23 @@ def _convert_aep(binary_bits: list[int]) -> float:
     return result
 
 
+def _convert_debug_temp(hex_str: str) -> float:
+    """Convert a 4-char hex string to a debug/cold-junction temperature.
+
+    Mirrors C#'s ConvertBinaryArrayToDebugTemp: bits 4-14 scaled by
+    2**(i-8), sign bit at bit 0. No family-code branching — this formula
+    applies regardless of wafer family, unlike _convert_hex_to_temp.
+    """
+    bits = _hex_to_binary(hex_str)
+    value = 0.0
+    for i in range(4, 15):
+        if bits[i]:
+            value += 2.0 ** (i - 8)
+    if bits[0]:
+        value = -value
+    return round(value, 2)
+
+
 def _convert_hex_to_temp(hex_str: str, family_code: str) -> float:
     """Convert a singi hale 4-char hex string to a float temperature."""
     bits = _hex_to_binary(hex_str)
@@ -225,6 +242,15 @@ def convert_to_temperatures(
     return temp_value
 
 
+def convert_to_debug_temperatures(hex_data: list[list[str]]) -> list[list[str]]:
+    """Convert debug/cold-junction hex values to temperature strings.
+
+    Same shape contract as convert_to_temperatures, but uses the
+    family-independent debug formula (_convert_debug_temp).
+    """
+    return [[str(_convert_debug_temp(h)) for h in row] for row in hex_data]
+
+
 def remove_trailing_zeros(data: list[list[str]]) -> None:
     """Remove rows of all-zero values from the end of data (in-place).
 
@@ -294,3 +320,46 @@ def save_to_csv(
     except Exception as exc:
         log.error("CSV save failed: %s", exc)
         return None
+
+
+def save_debug_csv(
+    temp_data: list[list[str]],
+    debug_data: list[list[str]],
+    output_dir: str,
+) -> Optional[str]:
+    """Save sensor + debug temperatures side-by-side to debug_info.csv.
+
+    Mirrors C#'s writeDebugCSV: alternating Sensor{j+1},Debug{j+1} columns,
+    truncated to the shorter of the two row/column counts. Fixed filename
+    (not timestamped), unlike save_to_csv.
+
+    Args:
+        temp_data: 2D array of sensor temperature strings (D1, decoded via
+            convert_to_temperatures).
+        debug_data: 2D array of debug temperature strings (F1, decoded via
+            convert_to_debug_temperatures).
+        output_dir: Directory to save the CSV file.
+
+    Returns:
+        Full file path on success, None on empty input or write failure.
+    """
+    if not temp_data or not debug_data:
+        log.error("Debug CSV save failed: temp or debug data is empty")
+        return None
+    try:
+        os.makedirs(output_dir, exist_ok=True)
+        num_cols = min(len(temp_data[0]), len(debug_data[0]))
+        num_rows = min(len(temp_data), len(debug_data))
+        filepath = os.path.join(output_dir, "debug_info.csv")
+        with open(filepath, "w", encoding="utf-8") as f:
+            headers = [f"Sensor{j + 1},Debug{j + 1}" for j in range(num_cols)]
+            f.write(",".join(headers) + "\n")
+            for i in range(num_rows):
+                row = [f"{temp_data[i][j]},{debug_data[i][j]}" for j in range(num_cols)]
+                f.write(",".join(row) + "\n")
+
+        log.info("Saved debug CSV: %d rows × %d cols to %s", num_rows, num_cols, filepath)
+        return filepath
+    except Exception as exc:
+        log.error("Debug CSV save failed: %s", exc)
+        return None

tests/test_chart_geometry.py

@@ -1,6 +1,10 @@
 import pytest
 
-from pygui.backend.visualization.chart_geometry import index_to_pixel, value_to_pixel
+from pygui.backend.visualization.chart_geometry import (
+    elapsed_to_pixel,
+    index_to_pixel,
+    value_to_pixel,
+)
 
 
 def test_value_to_pixel_min_maps_to_bottom():
@@ -26,3 +30,23 @@ def test_index_to_pixel_first_and_last():
 
 def test_index_to_pixel_single_point_centers():
     assert index_to_pixel(0, 1, pixel_start=0.0, pixel_span=100.0) == pytest.approx(50.0)
+
+
+def test_elapsed_to_pixel_window_start_maps_to_left():
+    assert elapsed_to_pixel(10.0, window_start=10.0, window_end=70.0,
+                             pixel_start=0.0, pixel_span=200.0) == pytest.approx(0.0)
+
+
+def test_elapsed_to_pixel_window_end_maps_to_right():
+    assert elapsed_to_pixel(70.0, window_start=10.0, window_end=70.0,
+                             pixel_start=0.0, pixel_span=200.0) == pytest.approx(200.0)
+
+
+def test_elapsed_to_pixel_midpoint():
+    assert elapsed_to_pixel(40.0, window_start=10.0, window_end=70.0,
+                             pixel_start=0.0, pixel_span=200.0) == pytest.approx(100.0)
+
+
+def test_elapsed_to_pixel_degenerate_window_pins_right():
+    assert elapsed_to_pixel(5.0, window_start=5.0, window_end=5.0,
+                             pixel_start=0.0, pixel_span=200.0) == pytest.approx(200.0)

tests/test_data_parser.py

@@ -3,11 +3,14 @@
 import pytest
 
 from pygui.serialcomm.data_parser import (
+    _convert_debug_temp,
     _convert_hex_to_temp,
+    convert_to_debug_temperatures,
     convert_to_temperatures,
     csv_column_count,
     parse_binary_data,
     remove_trailing_zeros,
+    save_debug_csv,
     save_to_csv,
 )
 
@@ -321,3 +324,97 @@ class TestSaveToCsv:
         assert len(headers) == 244, f"expected 244 cols, got {len(headers)}"
         assert len(data_row) == 244, f"expected 244 data cols, got {len(data_row)}"
         assert data_row[243] == "243.0", "last column value must be preserved"
+
+
+# ── Debug temperature conversion ───────────────────────────────────────────────
+
+
+class TestConvertDebugTemp:
+    """Spot-check known hex → debug temperature values.
+
+    Reference values derived from C#'s ConvertBinaryArrayToDebugTemp
+    (bits 4-14 scaled by 2**(i-8), sign at bit 0 — no family branching).
+    """
+
+    def test_zero_hex_gives_zero(self):
+        assert _convert_debug_temp("0000") == 0.0
+
+    def test_bit8_gives_one(self):
+        # bit index 8 set (value 0x0080) → contributes 2**(8-8) = 1.0
+        assert _convert_debug_temp("0080") == pytest.approx(1.0, abs=0.01)
+
+    def test_sign_bit_negates(self):
+        # sign bit (bit 0) + bit 8 → -1.0
+        assert _convert_debug_temp("8080") == pytest.approx(-1.0, abs=0.01)
+
+    def test_no_family_branching(self):
+        # Debug conversion takes no family code — same result regardless
+        assert _convert_debug_temp("0080") == _convert_debug_temp("0080")
+
+
+class TestConvertToDebugTemperatures:
+    def test_returns_same_shape(self):
+        hex_data = [["0080", "0000"], ["8080", "0000"]]
+        result = convert_to_debug_temperatures(hex_data)
+        assert len(result) == 2
+        assert len(result[0]) == 2
+
+    def test_values_are_strings(self):
+        result = convert_to_debug_temperatures([["0080"]])
+        assert isinstance(result[0][0], str)
+
+    def test_converts_known_value(self):
+        result = convert_to_debug_temperatures([["0080"]])
+        assert float(result[0][0]) == pytest.approx(1.0, abs=0.01)
+
+
+# ── Debug CSV export ────────────────────────────────────────────────────────────
+
+
+class TestSaveDebugCsv:
+    def test_creates_file_with_fixed_name(self, tmp_path):
+        result = save_debug_csv([["25.0"]], [["1.0"]], str(tmp_path))
+        assert result is not None
+        assert result.endswith("debug_info.csv")
+
+    def test_header_alternates_sensor_and_debug(self, tmp_path):
+        result = save_debug_csv([["25.0", "24.5"]], [["1.0", "2.0"]], str(tmp_path))
+        assert result is not None
+        header = open(result).readline().strip()
+        assert header == "Sensor1,Debug1,Sensor2,Debug2"
+
+    def test_data_row_alternates_values(self, tmp_path):
+        result = save_debug_csv([["25.0", "24.5"]], [["1.0", "2.0"]], str(tmp_path))
+        assert result is not None
+        lines = open(result).readlines()
+        assert lines[1].strip() == "25.0,1.0,24.5,2.0"
+
+    def test_truncates_to_shorter_row_count(self, tmp_path):
+        temp_data = [["25.0"], ["24.0"], ["23.0"]]
+        debug_data = [["1.0"], ["2.0"]]
+        result = save_debug_csv(temp_data, debug_data, str(tmp_path))
+        assert result is not None
+        lines = open(result).readlines()
+        assert len(lines) == 3  # 1 header + 2 data rows (shorter of the two)
+
+    def test_truncates_to_shorter_column_count(self, tmp_path):
+        temp_data = [["25.0", "24.0", "23.0"]]
+        debug_data = [["1.0", "2.0"]]
+        result = save_debug_csv(temp_data, debug_data, str(tmp_path))
+        assert result is not None
+        header = open(result).readline().strip()
+        assert header == "Sensor1,Debug1,Sensor2,Debug2"
+
+    def test_returns_none_on_empty_temp_data(self, tmp_path):
+        assert save_debug_csv([], [["1.0"]], str(tmp_path)) is None
+
+    def test_returns_none_on_empty_debug_data(self, tmp_path):
+        assert save_debug_csv([["25.0"]], [], str(tmp_path)) is None
+
+    def test_creates_output_dir_if_missing(self, tmp_path):
+        nested = str(tmp_path / "a" / "b")
+        result = save_debug_csv([["25.0"]], [["1.0"]], nested)
+        assert result is not None
+        from pathlib import Path
+
+        assert Path(result).exists()

tests/test_device_controller.py

@@ -133,6 +133,64 @@ def test_read_debug_handler(controller):
     assert controller.connectionStatus == "Connected"
     assert not controller.operationInProgress
 
+def _make_p_family_bytes(value: int = 0x0100) -> bytes:
+    """Synthetic single-block P-family binary: 244 valid words + 12 overhead."""
+    data = bytearray()
+    for i in range(256):
+        word = value if i < 244 else 0
+        data += word.to_bytes(2, byteorder="little")
+    return bytes(data)
+
+
+def test_debug_worker_decodes_and_saves_csv(controller, tmp_path):
+    controller._last_wafer_info = {"familyCode": "P"}
+    controller._save_data_dir = str(tmp_path)
+    controller._service.read_wafer_data = MagicMock(
+        side_effect=[_make_p_family_bytes(), _make_p_family_bytes()]
+    )
+
+    captured = {}
+    controller._debugFinished.connect(captured.update)
+
+    controller._debug_worker("COM1")
+
+    assert captured.get("success") is True
+    assert captured.get("sensor_bytes") == 512
+    assert captured.get("debug_bytes") == 512
+    assert "csv_path" in captured
+    from pathlib import Path
+    assert Path(captured["csv_path"]).exists()
+    assert Path(captured["csv_path"]).name == "debug_info.csv"
+
+
+def test_debug_worker_reports_error_when_csv_save_fails(controller, tmp_path):
+    controller._last_wafer_info = {"familyCode": "P"}
+    # Point save dir somewhere save_debug_csv cannot write to, so it returns None.
+    controller._save_data_dir = str(tmp_path / "debug_info.csv")  # a file, not a dir
+    (tmp_path / "debug_info.csv").write_text("occupied")
+    controller._service.read_wafer_data = MagicMock(
+        side_effect=[_make_p_family_bytes(), _make_p_family_bytes()]
+    )
+
+    captured = {}
+    controller._debugFinished.connect(captured.update)
+
+    controller._debug_worker("COM1")
+
+    assert captured.get("success") is not True
+    assert "error" in captured
+
+
+def test_debug_handler_logs_csv_path(controller):
+    controller._handle_debug_finished({
+        "success": True,
+        "sensor_bytes": 512,
+        "debug_bytes": 512,
+        "csv_path": "/tmp/debug_info.csv",
+    })
+    assert "/tmp/debug_info.csv" in controller.activityLog
+
+
 def test_parse_and_save_data_and_get_chart_data(controller):
     res = controller.getChartData()
     assert res == {"success": False}
@@ -233,3 +291,12 @@ def test_device_service_port_caching(controller):
         service.enumerate_ports()
         assert mock_run.call_count == 2
 
+
+
+def test_export_dir_created_under_save_data_dir(controller):
+    from pathlib import Path
+
+    result = controller.exportDir()
+
+    assert result == str(Path(controller.saveDataDir) / "Export")
+    assert Path(result).is_dir()

tests/test_file_browser.py

@@ -28,3 +28,16 @@ def test_recorded_live_file_flagged_as_recording(qapp, tmp_path):
     files_by_name = {Path(row["fileName"]).name: row for row in browser.files}
     assert files_by_name["live_P00001_20260706_143022.csv"]["isRecording"] is True
     assert files_by_name["P00002-20260706_143500.csv"]["isRecording"] is False
+
+
+def test_set_current_directory_updates_dir_and_refreshes(qapp, tmp_path):
+    """setCurrentDirectory (no native dialog) is how the Status tab's save-dir
+    picker keeps the Source panel pointed at the same folder."""
+    _write_csv(tmp_path / "P00003-20260706_143500.csv")
+
+    browser = FileBrowser()
+    browser.setCurrentDirectory(str(tmp_path))
+
+    assert browser.currentDirectory == str(tmp_path)
+    assert len(browser.files) == 1
+    assert Path(browser.files[0]["fileName"]).name == "P00003-20260706_143500.csv"

tests/test_frame_player.py

@@ -1,5 +1,5 @@
 from pygui.backend.models.frame import Frame
-from pygui.backend.models.frame_player import FramePlayer
+from pygui.backend.models.frame_player import FramePlayer, all_sensor_series
 
 
 def frames(n):
@@ -29,3 +29,24 @@ def test_at_end():
     assert not p.at_end
     p.seek(1)
     assert p.at_end
+
+def test_frames_property_exposes_loaded_frames():
+    p = FramePlayer(); p.load(frames(3))
+    assert p.frames == tuple(frames(3))
+
+
+# ---- all_sensor_series (Graph tab whole-run assembly) ----
+
+def test_all_sensor_series_empty_frames():
+    assert all_sensor_series([]) == ([], [])
+
+
+def test_all_sensor_series_names_and_columns():
+    fs = [
+        Frame(seq=0, time=0.0, values=[150.0, 148.0]),
+        Frame(seq=1, time=1.0, values=[151.0, 147.5]),
+        Frame(seq=2, time=2.0, values=[152.0, 147.0]),
+    ]
+    names, series = all_sensor_series(fs)
+    assert names == ["Sensor 1", "Sensor 2"]
+    assert series == [[150.0, 151.0, 152.0], [148.0, 147.5, 147.0]]

tests/test_frame_stats.py

@@ -2,7 +2,12 @@ import math
 
 import pytest
 
-from pygui.backend.models.frame_stats import Stats, compute_stats
+from pygui.backend.models.frame_stats import (
+    EdgeCenterStats,
+    Stats,
+    compute_edge_center,
+    compute_stats,
+)
 
 
 def test_basic_stat():
@@ -28,3 +33,43 @@ def test_ignores_nan():
     assert s.avg == pytest.approx(150.0)
     assert s.sigma == pytest.approx(1.0)
     assert s.three_sigma == pytest.approx(3.0)
+
+
+# ---- edge-center delta (ADR-0002) ----
+
+PAIRS = ((0, 4), (1, 4), (2, 5), (3, 5))
+
+
+def test_edge_center_min_max_pairs():
+    #        e0     e1     e2     e3     c4     c5
+    values = [150.0, 148.0, 151.0, 149.4, 149.0, 149.5]
+    ec = compute_edge_center(values, PAIRS, excluded=set())
+    # deltas: |150-149|=1.0, |148-149|=1.0, |151-149.5|=1.5, |149.4-149.5|=0.1
+    assert ec == EdgeCenterStats(
+        min_edge_index=3, min_center_index=5, min_edge=149.4, min_center=149.5,
+        min_delta=pytest.approx(0.1),
+        max_edge_index=2, max_center_index=5, max_edge=151.0, max_center=149.5,
+        max_delta=pytest.approx(1.5),
+    )
+
+
+def test_edge_center_skips_excluded_sensors():
+    values = [150.0, 148.0, 151.0, 149.4, 149.0, 149.5]
+    ec = compute_edge_center(values, PAIRS, excluded={2, 3})  # both c5 pairs out
+    assert ec is not None
+    assert ec.max_delta == pytest.approx(1.0)
+    # excluding a center sensor kills all its pairs
+    assert compute_edge_center(values, PAIRS, excluded={4, 5}) is None
+
+
+def test_edge_center_skips_nan_and_out_of_range():
+    values = [150.0, math.nan, 149.0]  # only pair (0, 2) is computable
+    ec = compute_edge_center(values, ((0, 2), (1, 2), (0, 9)), excluded=set())
+    assert ec is not None
+    assert ec.min_delta == ec.max_delta == pytest.approx(1.0)
+    assert (ec.min_edge_index, ec.min_center_index) == (0, 2)
+
+
+def test_edge_center_none_when_no_pairs():
+    assert compute_edge_center([1.0, 2.0], (), excluded=set()) is None
+    assert compute_edge_center([], PAIRS, excluded=set()) is None

tests/test_graph_quick_item.py

@@ -0,0 +1,289 @@
+"""Tests for src/pygui/backend/visualization/graph_quick_item.py."""
+import pytest
+
+pytestmark = pytest.mark.usefixtures("qapp")
+
+
+def test_no_data_initially():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    assert item.seriesData == []
+    assert item.sensorNames == []
+
+
+def test_series_data_setter_stores_series():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.seriesData = [[150.0, 151.0], [148.0, 147.5]]
+
+    assert item.seriesData == [[150.0, 151.0], [148.0, 147.5]]
+
+
+def test_series_data_auto_ranges_y_with_padding():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.seriesData = [[150.0, 100.0], [200.0, 120.0]]
+
+    # min=100, max=200, range=100, 10% pad => [90, 210]
+    assert item._min_y == pytest.approx(90.0)
+    assert item._max_y == pytest.approx(210.0)
+
+
+def test_series_data_empty_keeps_default_range():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.seriesData = []
+
+    assert item._min_y == 0.0
+    assert item._max_y == 150.0
+
+
+def test_sensor_names_setter_stores_names():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.sensorNames = ["Sensor 1", "Sensor 2"]
+
+    assert item.sensorNames == ["Sensor 1", "Sensor 2"]
+
+
+def test_non_numeric_values_are_skipped_not_crashing():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.seriesData = [[150.0, "bad", 151.0]]
+
+    assert item._min_y == pytest.approx(149.9)
+    assert item._max_y == pytest.approx(151.1)
+
+
+# ---- viewport_stats (replay chart min/max/avg readouts) ----
+# Independently hand-computed against PopupChartForm.cs's recalc_stats
+# semantics: aggregate across every sensor's points in [start, end], plus
+# which sensor achieved each extreme.
+
+
+def test_viewport_stats_full_range_aggregate():
+    from pygui.backend.visualization.graph_quick_item import viewport_stats
+
+    series = [[150.0, 151.0, 152.0], [148.0, 147.5, 147.0]]
+    names = ["Sensor 1", "Sensor 2"]
+
+    vmin, vmax, avg, min_sensor, max_sensor = viewport_stats(series, names, 0, 2)
+
+    assert vmin == pytest.approx(147.0)
+    assert vmax == pytest.approx(152.0)
+    assert avg == pytest.approx(149.25)
+    assert min_sensor == "Sensor 2"
+    assert max_sensor == "Sensor 1"
+
+
+def test_viewport_stats_restricted_to_subrange():
+    from pygui.backend.visualization.graph_quick_item import viewport_stats
+
+    series = [[150.0, 151.0, 152.0], [148.0, 147.5, 147.0]]
+    names = ["Sensor 1", "Sensor 2"]
+
+    vmin, vmax, avg, min_sensor, max_sensor = viewport_stats(series, names, 0, 1)
+
+    assert vmin == pytest.approx(147.5)
+    assert vmax == pytest.approx(151.0)
+    assert avg == pytest.approx(149.125)
+    assert min_sensor == "Sensor 2"
+    assert max_sensor == "Sensor 1"
+
+
+def test_viewport_stats_empty_series_returns_zeros():
+    from pygui.backend.visualization.graph_quick_item import viewport_stats
+
+    assert viewport_stats([], [], 0, -1) == (0.0, 0.0, 0.0, "", "")
+
+
+def test_viewport_stats_skips_non_numeric():
+    from pygui.backend.visualization.graph_quick_item import viewport_stats
+
+    series = [[150.0, "bad", 151.0]]
+    names = ["Sensor 1"]
+
+    vmin, vmax, avg, min_sensor, max_sensor = viewport_stats(series, names, 0, 2)
+
+    assert vmin == pytest.approx(150.0)
+    assert vmax == pytest.approx(151.0)
+    assert avg == pytest.approx(150.5)
+    assert min_sensor == "Sensor 1"
+    assert max_sensor == "Sensor 1"
+
+
+# ---- GraphQuickItem viewport properties (replay chart) ----
+# Default viewport (0, -1) means "whole series" so the already-shipped Graph
+# tab (which never sets these) is unaffected — see docs/adr/0004.
+
+
+def test_viewport_defaults_to_whole_range_and_markers_off():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+
+    assert item.viewStartIndex == 0
+    assert item.viewEndIndex == -1
+    assert item.showMinMaxMarkers is False
+
+
+def test_view_stats_reflect_default_full_range_viewport():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.sensorNames = ["Sensor 1", "Sensor 2"]
+    item.seriesData = [[150.0, 151.0, 152.0], [148.0, 147.5, 147.0]]
+
+    assert item.viewMin == pytest.approx(147.0)
+    assert item.viewMax == pytest.approx(152.0)
+    assert item.viewAvg == pytest.approx(149.25)
+    assert item.viewMinSensor == "Sensor 2"
+    assert item.viewMaxSensor == "Sensor 1"
+
+
+def test_view_stats_restrict_to_narrowed_viewport():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.sensorNames = ["Sensor 1", "Sensor 2"]
+    item.seriesData = [[150.0, 151.0, 152.0], [148.0, 147.5, 147.0]]
+
+    item.viewStartIndex = 0
+    item.viewEndIndex = 1
+
+    assert item.viewMin == pytest.approx(147.5)
+    assert item.viewMax == pytest.approx(151.0)
+    assert item.viewAvg == pytest.approx(149.125)
+
+
+def test_auto_range_y_restricted_to_narrowed_viewport():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.seriesData = [[150.0, 100.0], [200.0, 120.0]]
+    # Full-range Y (pre-existing behavior): min=100, max=200 -> [90, 210]
+    assert item._min_y == pytest.approx(90.0)
+    assert item._max_y == pytest.approx(210.0)
+
+    # Narrow the viewport to index 0 only: min=150, max=200, range=50, 10% pad
+    item.viewStartIndex = 0
+    item.viewEndIndex = 0
+
+    assert item._min_y == pytest.approx(145.0)
+    assert item._max_y == pytest.approx(205.0)
+
+
+# ---- zoomAtFraction / panByFraction / resetZoom (replay chart interaction) ----
+# 11-point series (indices 0..10) chosen so the zoom/pan arithmetic lands on
+# whole numbers -- avoids rounding ambiguity in the independent hand trace.
+
+
+def _eleven_point_item():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.seriesData = [[float(i) for i in range(11)]]
+    return item
+
+
+def test_zoom_in_centers_on_fraction():
+    item = _eleven_point_item()
+
+    # Full range is (0, 10), width 10. Zooming to 40% width centered at the
+    # midpoint (frac=0.5): center=5, new_width=4 -> new_start=3, new_end=7.
+    item.zoomAtFraction(0.5, 0.4)
+
+    assert item.viewStartIndex == 3
+    assert item.viewEndIndex == 7
+
+
+def test_zoom_out_clamps_to_data_bounds():
+    item = _eleven_point_item()
+    item.viewStartIndex = 3
+    item.viewEndIndex = 7
+
+    # width=4, zoom out 3x centered at midpoint (frac=0.5): requested
+    # new_width=12 exceeds the data's max width of 10, so it clamps to the
+    # full range (0, 10).
+    item.zoomAtFraction(0.5, 3.0)
+
+    assert item.viewStartIndex == 0
+    assert item.viewEndIndex == 10
+
+
+def test_pan_shifts_viewport_by_fraction_of_width():
+    item = _eleven_point_item()
+    item.viewStartIndex = 4
+    item.viewEndIndex = 8
+
+    # width=4, pan by 50% of width (2 indices): (4,8) -> (6,10)
+    item.panByFraction(0.5)
+
+    assert item.viewStartIndex == 6
+    assert item.viewEndIndex == 10
+
+
+def test_pan_clamps_at_right_edge_preserving_width():
+    item = _eleven_point_item()
+    item.viewStartIndex = 4
+    item.viewEndIndex = 8
+
+    # width=4, pan by 100% of width (4 indices) would be (8,12); index 12 is
+    # out of bounds (max index 10), so the whole window shifts back by 2 to
+    # stay in bounds while keeping width=4: (6,10).
+    item.panByFraction(1.0)
+
+    assert item.viewStartIndex == 6
+    assert item.viewEndIndex == 10
+
+
+def test_reset_zoom_restores_full_range_sentinel():
+    item = _eleven_point_item()
+    item.viewStartIndex = 3
+    item.viewEndIndex = 7
+
+    item.resetZoom()
+
+    assert item.viewStartIndex == 0
+    assert item.viewEndIndex == -1
+
+
+def test_zoom_noop_when_fewer_than_two_points():
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.seriesData = [[42.0]]
+
+    item.zoomAtFraction(0.5, 0.5)
+
+    assert item.viewStartIndex == 0
+    assert item.viewEndIndex == -1
+
+
+def test_loading_new_series_while_zoomed_resets_viewport_to_full_range():
+    """Regression: zooming near the tail of a long run, then loading a new
+    (shorter) file, left the stale viewport pointing past the new data --
+    every per-series slice became empty and the chart went blank with a
+    stale Y-range and zeroed-out min/max/avg readouts. New data must reset
+    the viewport to the full range (PopupChartForm.cs's SetData() parity).
+    """
+    from pygui.backend.visualization.graph_quick_item import GraphQuickItem
+
+    item = GraphQuickItem()
+    item.seriesData = [[float(i) for i in range(20)]]
+    item.viewStartIndex = 15
+    item.viewEndIndex = 19
+
+    item.seriesData = [[100.0, 101.0, 102.0, 103.0, 104.0]]
+
+    assert item.viewStartIndex == 0
+    assert item.viewEndIndex == -1
+    assert item.viewMin == pytest.approx(100.0)
+    assert item.viewMax == pytest.approx(104.0)
+    assert item.viewAvg == pytest.approx(102.0)

tests/test_graph_view.py

@@ -66,6 +66,51 @@ class TestUpdateTrend:
         gv.updateTrend("[1, 2, 3]")
 
 
+class TestUpdateChart:
+    def test_plots_one_series_per_sensor(self):
+        from pygui.backend.visualization.graph_view import GraphView
+
+        gv = GraphView()
+        gv._plot_widget = _make_plot_widget()
+
+        series = [[150.0, 151.0, 152.0], [148.5, 148.4, 148.6]]
+        gv.updateChart("Sensor 1,Sensor 2", json.dumps(series))
+
+        assert gv._plot_widget.clear.called
+        assert gv._plot_widget.plot.call_count == 2
+        assert gv._sensor_names == ["Sensor 1", "Sensor 2"]
+
+    def test_rejects_invalid_json(self):
+        from pygui.backend.visualization.graph_view import GraphView
+
+        gv = GraphView()
+        gv._plot_widget = _make_plot_widget()
+
+        gv.updateChart("Sensor 1", "not json")
+
+        assert not gv._plot_widget.plot.called
+
+    def test_empty_series_clears_without_plotting(self):
+        from pygui.backend.visualization.graph_view import GraphView
+
+        gv = GraphView()
+        gv._plot_widget = _make_plot_widget()
+
+        gv.updateChart("", "[]")
+
+        assert gv._plot_widget.clear.called
+        assert not gv._plot_widget.plot.called
+
+    def test_no_plot_widget(self):
+        from pygui.backend.visualization.graph_view import GraphView
+
+        gv = GraphView()
+        assert gv._plot_widget is None
+
+        # Should not crash
+        gv.updateChart("Sensor 1", json.dumps([[1.0, 2.0]]))
+
+
 class TestUpdateComparison:
     def test_parses_valid_json(self):
         from pygui.backend.visualization.graph_view import GraphView

tests/test_session_controller.py

@@ -1,8 +1,11 @@
+import json
 from unittest.mock import MagicMock
 
 import pytest
 
+import pygui.backend.controllers.session_controller as session_controller_module
 from pygui.backend.controllers.session_controller import SessionController
+from pygui.backend.models.frame import Frame
 
 
 @pytest.fixture
@@ -50,6 +53,49 @@ def test_pause_stop_timer(controller):
     controller.stop()
     assert controller.frameIndex == 0
 
+def test_graph_data_empty_before_load(controller):
+    assert controller.graphSensorNames == ""
+    assert controller.graphSeriesJson == "[]"
+
+def test_graph_data_after_load(controller):
+    controller.loadFile("tests/fixtures/sample_stream.csv")
+    assert controller.graphSensorNames == "Sensor 1,Sensor 2,Sensor 3"
+    series = json.loads(controller.graphSeriesJson)
+    assert series == [
+        [149.0, 149.2, 149.1],
+        [148.5, 148.4, 148.6],
+        [150.6, 150.7, 150.5],
+    ]
+
+def test_graph_data_cleared_after_unload(controller):
+    controller.loadFile("tests/fixtures/sample_stream.csv")
+    controller.unloadFile()
+    assert controller.graphSensorNames == ""
+    assert controller.graphSeriesJson == "[]"
+
+def test_leaving_live_mode_blanks_wafer_map(controller):
+    """Stopping a live session (tab switch → setMode) must not leave stale
+    sensor values on the wafer map — it should read as blank."""
+    frame_signal = MagicMock()
+    controller.frameUpdated.connect(frame_signal)
+
+    controller.setMode("live")
+    controller._on_live_frame(Frame(seq=1, time=0.0, values=[100.0] * 22))
+    assert controller.sensorValues, "sanity: live frame should populate the map"
+
+    controller.setMode("review")
+    assert controller.sensorValues == []
+    assert controller.stats == {}
+    assert frame_signal.called, "QML needs frameUpdated to repaint blank"
+
+
+def test_leaving_live_mode_stops_stream(controller):
+    controller.setMode("live")
+    controller.setMode("review")
+    assert controller._reader is None
+    assert not controller._repaint_timer.isActive()
+
+
 def test_compare_files_integration(controller):
     # Mock the comparisonResult signal
     mock_slot = MagicMock()
@@ -194,3 +240,75 @@ def test_export_segment_bad_index(qapp, controller, tmp_path):
     controller.segmentExported.connect(exported)
     controller.exportSegment(99)
     assert exported.call_args[0][0]["success"] is False
+
+
+def test_reset_live_trend_sets_start_time_and_emits_reset(controller, monkeypatch):
+    monkeypatch.setattr(session_controller_module.time, "monotonic", lambda: 100.0)
+
+    reset_seen = MagicMock()
+    controller.trendReset.connect(reset_seen)
+    controller._reset_live_trend()
+
+    assert controller._stream_start_time == 100.0
+    assert reset_seen.called
+
+
+def test_on_live_frame_emits_trend_delta_with_elapsed_seconds(controller, monkeypatch):
+    controller._stream_start_time = 100.0
+    monkeypatch.setattr(session_controller_module.time, "monotonic", lambda: 102.5)
+
+    delta_seen = MagicMock()
+    controller.trendDelta.connect(delta_seen)
+
+    frame = Frame(seq=1, time=102.5, values=[10.0, 20.0, 30.0])
+    controller._on_live_frame(frame)
+
+    payload = json.loads(delta_seen.call_args[0][0])
+    assert len(payload) == 1
+    elapsed, avg = payload[0]
+    assert elapsed == pytest.approx(2.5)
+    assert avg == pytest.approx(20.0)
+
+
+# ---- edge-center stats exposure (ADR-0002) ----
+
+def _write_f_family_csv(path):
+    """22-sensor F-family stream: pair (0,18) has delta 1.0, all others 0."""
+    n = 22
+    values = [149.0] * n
+    values[0] = 150.0
+    lines = [
+        "Wafer ID=F12",
+        "Acquisition Date=03/26/2025",
+        "Label," + ",".join(str(i + 1) for i in range(n)),
+        "X (mm)," + ",".join(str(i) for i in range(n)),
+        "Y (mm)," + ",".join(str(i) for i in range(n)),
+        "data",
+        "0.0," + ",".join(f"{v:.1f}" for v in values),
+    ]
+    path.write_text("\n".join(lines) + "\n", encoding="utf-8")
+
+
+def test_stats_include_edge_center_for_known_family(controller, tmp_path):
+    csv = tmp_path / "f_run.csv"
+    _write_f_family_csv(csv)
+    controller.loadFile(str(csv))
+    s = controller.stats
+    assert s["ecMaxDelta"] == pytest.approx(1.0)
+    assert s["ecMaxEdgeIndex"] == 1 and s["ecMaxCenterIndex"] == 19  # 1-origin
+    assert s["ecMaxEdgeValue"] == pytest.approx(150.0)
+    assert s["ecMaxCenterValue"] == pytest.approx(149.0)
+    assert s["ecMinDelta"] == pytest.approx(0.0)
+
+
+def test_stats_edge_center_skips_replaced_sensor(controller, tmp_path):
+    csv = tmp_path / "f_run.csv"
+    _write_f_family_csv(csv)
+    controller.loadFile(str(csv))
+    controller.replaceSensor(0, 149.0)  # replaced: pair (0,18) must be skipped
+    assert controller.stats["ecMaxDelta"] == pytest.approx(0.0)
+
+
+def test_stats_edge_center_absent_for_unknown_or_short_family(controller):
+    controller.loadFile("tests/fixtures/sample_stream.csv")  # A12, 3 sensors
+    assert "ecMaxDelta" not in controller.stats

tests/test_trend_chart_item.py

@@ -0,0 +1,82 @@
+"""Tests for src/pygui/backend/visualization/trend_chart_item.py."""
+import json
+
+import pytest
+
+# Use the session-scoped qapp fixture from conftest.py so Qt Property/Signal
+# descriptors work properly.
+pytestmark = pytest.mark.usefixtures("qapp")
+
+
+def test_no_data_initially():
+    from pygui.backend.visualization.trend_chart_item import TrendChartItem
+
+    item = TrendChartItem()
+    assert item.hasData is False
+
+
+def test_append_delta_adds_point_and_sets_has_data():
+    from pygui.backend.visualization.trend_chart_item import TrendChartItem
+
+    item = TrendChartItem()
+    item.appendDelta(json.dumps([[1.5, 42.0]]))
+
+    assert item.hasData is True
+    assert item._points == [(1.5, 42.0)]
+
+
+def test_append_delta_accumulates_across_calls():
+    from pygui.backend.visualization.trend_chart_item import TrendChartItem
+
+    item = TrendChartItem()
+    item.appendDelta(json.dumps([[0.0, 10.0]]))
+    item.appendDelta(json.dumps([[1.0, 20.0]]))
+
+    assert item._points == [(0.0, 10.0), (1.0, 20.0)]
+
+
+def test_append_delta_prunes_points_older_than_60s_window():
+    from pygui.backend.visualization.trend_chart_item import TrendChartItem
+
+    item = TrendChartItem()
+    item.appendDelta(json.dumps([[0.0, 10.0]]))
+    item.appendDelta(json.dumps([[70.0, 20.0]]))
+
+    assert item._points == [(70.0, 20.0)]
+
+
+def test_append_delta_ignores_malformed_json():
+    from pygui.backend.visualization.trend_chart_item import TrendChartItem
+
+    item = TrendChartItem()
+    item.appendDelta("not json")
+
+    assert item._points == []
+    assert item.hasData is False
+
+
+def test_append_delta_skips_repaint_when_no_points_added():
+    from unittest.mock import MagicMock
+
+    from pygui.backend.visualization.trend_chart_item import TrendChartItem
+
+    item = TrendChartItem()
+    item.appendDelta(json.dumps([[1.0, 10.0]]))
+    item.update = MagicMock()
+
+    item.appendDelta("not json")
+
+    assert item.update.called is False
+
+
+def test_clear_trend_resets_points_and_has_data():
+    from pygui.backend.visualization.trend_chart_item import TrendChartItem
+
+    item = TrendChartItem()
+    item.appendDelta(json.dumps([[1.0, 10.0]]))
+    assert item.hasData is True
+
+    item.clearTrend()
+
+    assert item._points == []
+    assert item.hasData is False

tests/test_wafer_layouts.py

@@ -1,7 +1,11 @@
 """Tests for src/pygui/backend/wafer_layouts.py."""
 import pytest
 
-from pygui.backend.wafer.wafer_layouts import available_families, load_layout
+from pygui.backend.wafer.wafer_layouts import (
+    available_families,
+    ec_pairs_for_wafer_id,
+    load_layout,
+)
 from pygui.backend.wafer.zwafer_models import Sensor
 
 
@@ -20,3 +24,27 @@ def test_loads_sensors_in_mm():
 def test_unknown_family_raises():
     with pytest.raises(KeyError):
         load_layout("nope")
+
+
+# ---- edge-center pair tables (ADR-0002) ----
+
+def test_ec_pairs_aep_match_csharp_table():
+    pairs = ec_pairs_for_wafer_id("A00123")
+    assert pairs[0] == (0, 40)
+    assert pairs[-1] == (15, 47)
+    assert len(pairs) == 16
+    assert ec_pairs_for_wafer_id("E1") == pairs
+    assert ec_pairs_for_wafer_id("P1") == pairs
+
+
+def test_ec_pairs_per_family_classes():
+    assert len(ec_pairs_for_wafer_id("B00108")) == 12
+    assert ec_pairs_for_wafer_id("C1") == ec_pairs_for_wafer_id("D1")
+    assert ec_pairs_for_wafer_id("F1")[0] == (0, 18)
+    assert ec_pairs_for_wafer_id("X1")[0] == (5, 76)
+    assert ec_pairs_for_wafer_id("Z1")[0] == (49, 0)
+
+
+def test_ec_pairs_unknown_family_empty():
+    assert ec_pairs_for_wafer_id("Q999") == ()
+    assert ec_pairs_for_wafer_id("") == ()

tests/test_wafer_map_item.py

@@ -8,20 +8,6 @@ import pytest
 pytestmark = pytest.mark.usefixtures("qapp")
 
 
-def test_export_image_valid_path():
-    """export_image saves a PNG when grabToImage succeeds."""
-    from pygui.backend.visualization.wafer_map_item import WaferMapItem
-
-    item = WaferMapItem()
-
-    mock_image = MagicMock()
-    mock_result = MagicMock()
-    mock_result.image.return_value = mock_image
-    item.grabToImage = MagicMock(return_value=mock_result)
-
-    assert item.export_image("/tmp/test_wafer.png") is True
-
-
 def test_export_image_empty_path():
     """export_image returns False for empty/None path."""
     from pygui.backend.visualization.wafer_map_item import WaferMapItem
@@ -31,29 +17,23 @@ def test_export_image_empty_path():
     assert item.export_image(None) is False
 
 
-def test_export_image_grab_fails():
-    """export_image returns False when grabToImage raises."""
+def test_export_image_zero_size_item_fails():
+    """export_image returns False when the item has no geometry to render."""
     from pygui.backend.visualization.wafer_map_item import WaferMapItem
 
     item = WaferMapItem()
-    item.grabToImage = MagicMock(side_effect=RuntimeError("grab failed"))
-
     assert item.export_image("/tmp/test_wafer.png") is False
 
 
-def test_export_image_save_fails():
-    """export_image returns False when image.save raises."""
+def test_export_image_unwritable_path_fails(tmp_path):
+    """export_image returns False when the target directory doesn't exist."""
     from pygui.backend.visualization.wafer_map_item import WaferMapItem
 
-    mock_image = MagicMock()
-    mock_image.save.side_effect = IOError("disk full")
-    mock_result = MagicMock()
-    mock_result.image.return_value = mock_image
-
     item = WaferMapItem()
-    item.grabToImage = MagicMock(return_value=mock_result)
-
-    assert item.export_image("/tmp/test_wafer.png") is False
+    item.setWidth(100)
+    item.setHeight(100)
+    item.values = [10.0, 20.0, 30.0]
+    assert item.export_image(str(tmp_path / "no_such_dir" / "wafer.png")) is False
 
 
 def test_thickness_properties():
@@ -67,16 +47,89 @@ def test_thickness_properties():
 
 
 def test_thickness_setter_updates_data():
-    """Setting thicknessData updates _thickness_data."""
+    """Setting thicknessData stores [x, y, t2] triples."""
     from pygui.backend.visualization.wafer_map_item import WaferMapItem
 
     item = WaferMapItem()
     item._rebuild_thickness = MagicMock()
 
-    item.thicknessData = [1.0, 2.0, 3.0]
+    item.thicknessData = [[0.0, 10.0, 1.5], [5.0, -5.0, 2.0]]
 
-    assert item._thickness_data == [1.0, 2.0, 3.0]
+    assert item._thickness_data == [[0.0, 10.0, 1.5], [5.0, -5.0, 2.0]]
     assert item._rebuild_thickness.called
+    assert item.hasThickness is True
+
+
+THICKNESS_HEADER = "Lot Start Time,RC,Site#,Slot#,T2,NGOF,Wafer X,Wafer Y\n"
+
+
+def _write_csv(tmp_path, body, header=THICKNESS_HEADER):
+    p = tmp_path / "thickness.csv"
+    p.write_text(header + body)
+    return str(p)
+
+
+def test_parse_thickness_csv_valid(tmp_path):
+    from pygui.backend.visualization.wafer_map_item import parse_thickness_csv
+
+    path = _write_csv(tmp_path,
+                      "t,1,1,7,1.5,0,10.0,-20.0\n"
+                      "t,1,2,7,2.5,0,-30.0,40.0\n")
+    points, err = parse_thickness_csv(path)
+    assert err == ""
+    assert points == [[10.0, -20.0, 1.5], [-30.0, 40.0, 2.5]]
+
+
+def test_parse_thickness_csv_first_slot_only(tmp_path):
+    """Rows after the Slot# changes belong to another wafer and are skipped."""
+    from pygui.backend.visualization.wafer_map_item import parse_thickness_csv
+
+    path = _write_csv(tmp_path,
+                      "t,1,1,7,1.5,0,10.0,-20.0\n"
+                      "t,1,1,8,9.9,0,0.0,0.0\n")
+    points, err = parse_thickness_csv(path)
+    assert err == ""
+    assert points == [[10.0, -20.0, 1.5]]
+
+
+def test_parse_thickness_csv_bad_header(tmp_path):
+    from pygui.backend.visualization.wafer_map_item import parse_thickness_csv
+
+    path = _write_csv(tmp_path, "t,1,1,7,1.5,0,10.0,-20.0\n", header="A,B,C\n")
+    points, err = parse_thickness_csv(path)
+    assert points == []
+    assert "header" in err
+
+
+def test_parse_thickness_csv_malformed_value(tmp_path):
+    from pygui.backend.visualization.wafer_map_item import parse_thickness_csv
+
+    path = _write_csv(tmp_path, "t,1,1,7,oops,0,10.0,-20.0\n")
+    points, err = parse_thickness_csv(path)
+    assert points == []
+    assert "Malformed" in err
+
+
+def test_parse_thickness_csv_missing_file():
+    from pygui.backend.visualization.wafer_map_item import parse_thickness_csv
+
+    points, err = parse_thickness_csv("/no/such/file.csv")
+    assert points == []
+    assert "Unable to read" in err
+
+
+def test_load_thickness_slot(tmp_path):
+    """loadThickness feeds parsed points into thicknessData."""
+    from pygui.backend.visualization.wafer_map_item import WaferMapItem
+
+    item = WaferMapItem()
+    path = _write_csv(tmp_path, "t,1,1,7,1.5,0,10.0,-20.0\n")
+    assert item.loadThickness(path) == ""
+    assert item.hasThickness is True
+
+    assert item.loadThickness("/no/such/file.csv") != ""
+    # Failed load keeps the previously loaded data.
+    assert item.hasThickness is True
 
 
 def test_show_thickness_setter():
@@ -88,3 +141,157 @@ def test_show_thickness_setter():
 
     item.showThickness = True
     assert item._show_thickness is True
+
+
+def test_export_image_writes_real_png_headless(tmp_path):
+    """export_image must produce an actual decodable image file without a
+    QQuickWindow — the button was silently failing because grabToImage()
+    resolves asynchronously and never completes headless/immediately."""
+    from PySide6.QtGui import QImage
+
+    from pygui.backend.visualization.wafer_map_item import WaferMapItem
+
+    item = WaferMapItem()
+    item.setWidth(200)
+    item.setHeight(200)
+    item.values = [10.0, 20.0, 30.0]
+    out = tmp_path / "wafer.png"
+
+    assert item.export_image(str(out)) is True
+    assert out.exists()
+    loaded = QImage(str(out))
+    assert not loaded.isNull()
+    assert loaded.width() == 200
+
+
+def test_export_image_includes_metrics_footer(tmp_path):
+    """With sensor values loaded, the export gains a footer strip below the
+    map carrying the metric readouts (sensors / min / max / avg)."""
+    from PySide6.QtGui import QImage
+
+    from pygui.backend.visualization.wafer_map_item import WaferMapItem
+
+    item = WaferMapItem()
+    item.setWidth(200)
+    item.setHeight(200)
+    item.values = [10.0, 20.0, 30.0]
+    out = tmp_path / "wafer.png"
+
+    assert item.export_image(str(out)) is True
+    loaded = QImage(str(out))
+    assert loaded.height() > 200  # footer strip appended
+    # footer is painted opaque (dark bg), not transparent
+    assert loaded.pixelColor(5, loaded.height() - 5).alpha() == 255
+
+
+def test_export_image_extra_line_grows_footer(tmp_path):
+    """Live export passes an extra metrics line; the footer gains a second
+    row for it. Review export (no extra) keeps the single-row footer."""
+    from PySide6.QtGui import QImage
+
+    from pygui.backend.visualization.wafer_map_item import WaferMapItem
+
+    item = WaferMapItem()
+    item.setWidth(200)
+    item.setHeight(200)
+    item.values = [10.0, 20.0, 30.0]
+
+    review = tmp_path / "review.png"
+    live = tmp_path / "live.png"
+    assert item.export_image(str(review)) is True
+    assert item.export_image(str(live), "Frames: 42   Errors: 0") is True
+
+    h_review = QImage(str(review)).height()
+    h_live = QImage(str(live)).height()
+    assert h_review > 200  # readout footer present
+    assert h_live > h_review  # extra live row appended
+
+
+def test_export_image_highlights_hottest_and_coldest(tmp_path):
+    """The exported map rings the hottest sensor in the high color and the
+    coldest in the low color. With no bands set every marker fill is the
+    in-range green, so any high/low-colored pixels must come from the rings."""
+    from PySide6.QtGui import QImage
+
+    from pygui.backend.visualization.wafer_map_item import WaferMapItem
+
+    item = WaferMapItem()
+    item.setWidth(200)
+    item.setHeight(200)
+    item.sensors = [
+        {"label": "1", "x": -50.0, "y": 0.0},
+        {"label": "2", "x": 0.0, "y": 0.0},
+        {"label": "3", "x": 50.0, "y": 0.0},
+    ]
+    item.values = [10.0, 20.0, 30.0]
+    out = tmp_path / "wafer.png"
+    assert item.export_image(str(out)) is True
+
+    img = QImage(str(out))
+    found = {img.pixelColor(x, y).name()
+             for y in range(img.height()) for x in range(img.width())}
+    assert "#ef4444" in found  # hottest ring (sensorHigh)
+    assert "#5b9df5" in found  # coldest ring (sensorLow)
+
+
+def test_show_extremes_toggle_gates_peak_rings(tmp_path):
+    """showExtremes (Display setting) hides the hot/cold rings when off.
+    Same pixel probe as the highlight test: with rings off, no high/low
+    colored pixels should appear anywhere."""
+    from PySide6.QtGui import QImage
+
+    from pygui.backend.visualization.wafer_map_item import WaferMapItem
+
+    item = WaferMapItem()
+    assert item.showExtremes is True  # rings on by default
+
+    item.setWidth(200)
+    item.setHeight(200)
+    item.sensors = [
+        {"label": "1", "x": -50.0, "y": 0.0},
+        {"label": "2", "x": 0.0, "y": 0.0},
+        {"label": "3", "x": 50.0, "y": 0.0},
+    ]
+    item.values = [10.0, 20.0, 30.0]
+    item.showExtremes = False
+    out = tmp_path / "wafer.png"
+    assert item.export_image(str(out)) is True
+
+    img = QImage(str(out))
+    found = {img.pixelColor(x, y).name()
+             for y in range(img.height()) for x in range(img.width())}
+    assert "#ef4444" not in found
+    assert "#5b9df5" not in found
+
+
+def test_readout_text_full_stats():
+    """Export footer readout carries every READOUT stat with sensor indices.
+
+    Worked example: [10, 20, 30] → min 10 (#1), max 30 (#3), diff 20,
+    avg 20, σ = sqrt(200/3) ≈ 8.16, 3σ ≈ 24.49.
+    """
+    from pygui.backend.visualization.wafer_map_item import readout_text
+
+    assert readout_text([10.0, 20.0, 30.0]) == (
+        "Sensors: 3   Min: 10.00°C (#1)   Max: 30.00°C (#3)   "
+        "Diff: 20.00   Avg: 20.00   σ: 8.16   3σ: 24.49"
+    )
+
+
+def test_readout_text_empty():
+    from pygui.backend.visualization.wafer_map_item import readout_text
+
+    assert readout_text([]) == ""
+
+
+def test_export_image_no_data_fails(tmp_path):
+    """No file loaded / no stream played -> nothing meaningful to export."""
+    from pygui.backend.visualization.wafer_map_item import WaferMapItem
+
+    item = WaferMapItem()
+    item.setWidth(200)
+    item.setHeight(200)
+    out = tmp_path / "wafer.png"
+
+    assert item.export_image(str(out)) is False
+    assert not out.exists()