feat(ui): improve device session management, update data directory paths, and add session clearing functionality.

src/pygui/ISC/HomePage.qml

@@ -24,6 +24,19 @@ Rectangle {
     property int selectedTabIndex: 0
     property int selectedSideActionIndex: -1   // nothing active on startup
 
+    Connections {
+        target: deviceController
+        function onParsedDataReady(result) {
+            if (result.success && result.csv_path) {
+                // Load the freshly read CSV into the player
+                streamController.loadFile(result.csv_path)
+
+                // Automatically switch to the "Wafer Map Tab"  (index 3)
+                root.selectedTabIndex = 3
+            }
+        }
+    }
+
     // ===== Main Two-Column Layout =====
     RowLayout {
         anchors.fill: parent
@@ -60,9 +73,19 @@ Rectangle {
                         onClicked: {
                             root.selectedSideActionIndex = index
                             root.selectedTabIndex = 0          // always jump to Status tab
-                            if (index === 0) deviceController.detectWafer()
+                            if (index === 0) {
-                            else if (index === 1) deviceController.readMemoryAsync()
+                                streamController.setMode("review")
-                            else if (index === 2) deviceController.openCsvFile()
+                                streamController.stopStream()
+                                deviceController.detectWafer()
+                            }
+                            else if (index === 1) {
+                                streamController.setMode("review")
+                                streamController.stopStream()
+                                deviceController.readMemoryAsync()
+                            }
+                            else if (index === 2) {
+                                deviceController.openCsvFile()
+                            }
                         }
 
                         background: Rectangle {
@@ -182,6 +205,7 @@ Rectangle {
                     color: Theme.tabBarBackground
                     border.color: Theme.workspaceBorder
                     border.width: Theme.borderThin
+                    radius: Theme.radiusMd
 
                     RowLayout {
                         anchors.fill: parent

src/pygui/ISC/Tabs/StatusTab.qml

@@ -47,11 +47,7 @@ ColumnLayout {
         Rectangle {
             Layout.fillWidth: true
             Layout.preferredHeight: 86
-            color: {
+            color: Theme.cardBackground
-                if (deviceController.connectionStatus === "Connected") return Theme.statusSuccessColor + "22"
-                if (deviceController.connectionStatus === "Disconnected") return Theme.statusErrorColor + "22"
-                return Theme.cardBackground
-            }
             border.color: {
                 if (deviceController.connectionStatus === "Connected") return Theme.statusSuccessColor
                 if (deviceController.connectionStatus === "Disconnected") return Theme.statusErrorColor
@@ -187,27 +183,105 @@ ColumnLayout {
         }
 
         // --- Activity Log ---
-        GroupBox {
+        Rectangle {
-            title: "Activity Log"
             Layout.fillWidth: true
             Layout.fillHeight: true
+            color: Theme.cardBackground
+            border.color: Theme.cardBorder
+            radius: Theme.radiusMd
+            clip: true
 
-            ScrollView {
+            ColumnLayout {
                 anchors.fill: parent
-                clip: true
+                spacing: 0
 
-                 TextArea {
+                // Header
-                     id: activityLog
+                Rectangle {
-                     width: parent.width
+                    Layout.fillWidth: true
-                     text: ""
+                    Layout.preferredHeight: 40
-                     readOnly: true
+                    color: Theme.subtleSectionBackground
-                     font.family: "monospace"
+                    
-                     font.pixelSize: 12
+                    RowLayout {
-                     wrapMode: TextArea.WordWrap
+                        anchors.fill: parent
-                     leftPadding: 4
+                        anchors.leftMargin: Theme.panelPadding
-                     rightPadding: 4
+                        anchors.rightMargin: Theme.panelPadding
-                     color: Theme.bodyColor
+                        
-                 }
+                        Label {
+                            text: "ACTIVITY LOG"
+                            color: Theme.bodyColor
+                            font.pixelSize: 10
+                            font.letterSpacing: 1.8
+                            font.weight: Font.Medium
+                            Layout.fillWidth: true
+                            Layout.alignment: Qt.AlignVCenter
+                        }
+                        
+                        Button {
+                            text: "REFRESH SESSION"
+                            font.pixelSize: 10
+                            implicitHeight: 24
+                            hoverEnabled: true
+                            background: Rectangle {
+                                color: parent.hovered ? Theme.buttonNeutralHover : "transparent"
+                                radius: Theme.radiusSm
+                            }
+                            contentItem: Text {
+                                text: parent.text
+                                color: Theme.bodyColor
+                                font: parent.font
+                                horizontalAlignment: Text.AlignHCenter
+                                verticalAlignment: Text.AlignVCenter
+                            }
+                            onClicked: deviceController.clearSession()
+                        }
+                        
+                        Button {
+                            text: "CLEAR LOG"
+                            font.pixelSize: 10
+                            implicitHeight: 24
+                            hoverEnabled: true
+                            background: Rectangle {
+                                color: parent.hovered ? Theme.buttonNeutralHover : "transparent"
+                                radius: Theme.radiusSm
+                            }
+                            contentItem: Text {
+                                text: parent.text
+                                color: Theme.bodyColor
+                                font: parent.font
+                                horizontalAlignment: Text.AlignHCenter
+                                verticalAlignment: Text.AlignVCenter
+                            }
+                            onClicked: deviceController.clearActivityLog()
+                        }
+                    }
+                    
+                    Rectangle {
+                        anchors.bottom: parent.bottom
+                        anchors.left: parent.left
+                        anchors.right: parent.right
+                        height: 1
+                        color: Theme.cardBorder
+                    }
+                }
+
+                ScrollView {
+                    Layout.fillWidth: true
+                    Layout.fillHeight: true
+                    Layout.margins: Theme.panelPadding
+                    clip: true
+
+                     TextArea {
+                         id: activityLog
+                         width: parent.width
+                         text: ""
+                         readOnly: true
+                         font.family: "monospace"
+                         font.pixelSize: 12
+                         wrapMode: TextArea.WordWrap
+                         color: Theme.bodyColor
+                         background: null
+                     }
+                }
             }
 
             Connections {

src/pygui/ISC/Tabs/WaferMapTab.qml

@@ -81,7 +81,20 @@ Item {
                     }
                 }
                 onCurrentIndexChanged:
-                    streamController.setMode(currentIndex === 0 ? "live" : "review")
+                    if (currentIndex === 0){
+                        // Entering Live mode, only work when wafer detected/connected
+                        streamController.setMode("live")
+                        if (deviceController.connectionStatus === "Connected") {
+                            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")
+                    }
             }
 
             // Live source info: WiFi icon + port · serial

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

@@ -15,6 +15,8 @@ Item {
         sensors: streamController.sensorLayout      // [{label,x,y}]
         values: streamController.sensorValues       // [float]
         bands: streamController.sensorBands         // ["in_range"|"high"|"low"]
+        shape: streamController.waferShape
+        size: streamController.waferSize
         target: streamController.target
         margin: streamController.margin
         blend: root.blend

src/pygui/__main__.py

@@ -1,5 +1,6 @@
 import sys
 from pathlib import Path
+import logging
 
 from PySide6.QtQml import QQmlApplicationEngine
 from PySide6.QtQuickControls2 import QQuickStyle
@@ -15,6 +16,10 @@ from pygui.backend.visualization.wafer_map_item import WaferMapItem
 
 # ===== Application Entry Point =====
 def main() -> int:
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)s [%(levelname)s] %(name)s: %(message)s"
+    )
     # ===== UI Style Setup =====
     # Use a non-native controls style so our custom QML button backgrounds are supported.
     QQuickStyle.setStyle("Basic")

src/pygui/backend/controllers/device_controller.py

@@ -1,10 +1,4 @@
-"""QML-exposed controller for wafer device communication.
+"""QML-exposed controller for wafer device communication."""
-
-Bridges DeviceService (serialcomm) to QML via @Slot methods and signals.
-All hardware operations run synchronously on the main thread (matching
-C# Form1.cs per-operation open/close pattern).  For long operations
-(erase ~15s, read up to 120s) the caller should show a loading state.
-"""
 
 from __future__ import annotations
 
@@ -67,9 +61,8 @@ class DeviceController(QObject):
         self._operation_in_progress = False
         self._activity_log: list[str] = getattr(settings, 'activity_log', [])
         self._raw_bytes: Optional[bytes] = None
-        # Default save dir lives next to the settings file (~/Documents/isc_data/csv)
         from pathlib import Path
-        self._save_data_dir: str = getattr(settings, 'save_data_dir', str(Path.home() / "Documents" / "isc_data" / "csv"))
+        self._save_data_dir: str = getattr(settings, 'save_data_dir', "") or str(Path(self._data_dir) / "csv")
         self._last_wafer_info: dict[str, Any] = getattr(settings, 'last_wafer_info', {})
         self._last_csv_path: str = getattr(settings, 'last_csv_path', "")
         self._selected_port: str = getattr(settings, 'selected_port', "")
@@ -209,6 +202,28 @@ class DeviceController(QObject):
             self._activity_log = self._activity_log[-200:]
         self.activityLogUpdated.emit("\n".join(self._activity_log))
 
+    @Slot()
+    def clearActivityLog(self) -> None:
+        """Clear the activity log."""
+        self._activity_log.clear()
+        self.activityLogUpdated.emit("")
+        self._save_status()
+
+    @Slot()
+    def clearSession(self) -> None:
+        """Clear the current session state, allowing a clean detect."""
+        self._connection_status = "Disconnected"
+        self._selected_port = ""
+        self._last_wafer_info = {}
+        self._data_row_count = 0
+        self._data_col_count = 0
+        self._raw_bytes = None
+        self._operation_in_progress = False
+        self.detectResult.emit(None)
+        self.portsUpdated.emit(self.availablePorts)
+        self._append_log("Session refreshed/cleared")
+        self._save_status()
+
     def _set_operation_progress(self, in_progress: bool) -> None:
         """Set operation progress state and notify QML.
 
@@ -424,12 +439,10 @@ class DeviceController(QObject):
             return
 
         if not self._save_data_dir:
-            self._append_log("No save data directory set")
+            from pathlib import Path
-            self.parsedDataReady.emit({
+            self._save_data_dir = str(Path(self._data_dir) / "csv")
-                "success": False,
+            self._append_log(f"Auto-set save directory to: {self._save_data_dir}")
-                "error": "No save data directory set",
+            self._save_status()
-            })
-            return
 
         fc = family_code or (
             self._last_wafer_info.get("familyCode", "")
@@ -509,7 +522,7 @@ class DeviceController(QObject):
         self._settings.last_csv_path = self._last_csv_path
 
         # Save to disk
-        LocalSettings.save_settings(str(LocalSettings._settings_path(self._data_dir)), self._settings)
+        LocalSettings.save_settings(self._data_dir, self._settings)
 
     # ---- Helpers ----
 

src/pygui/backend/data/local_settings_model.py

@@ -52,7 +52,7 @@ class LocalSettingsModel(QObject):
             QStandardPaths.DocumentsLocation
         )
         base_dir = Path(documents_dir) if documents_dir else (Path.home() / "Documents")
-        return base_dir / "isc_data"
+        return base_dir / "ISC_DATA"
 
     def _new_defaults(self) -> dict[str, Any]:
         return {