Add SettingsTab, StatusTab, DataTab and wire up DeviceController

- SettingsTab: chamber ID, master CSV mapping, wafer behavior toggle,
  light/dark mode toggle, Edit CSV Metadata dialog
- StatusTab: connection status, wafer info, activity log (blank until
  Detect Wafer fires)
- DataTab: empty state, ready for parsed data
- HomePage: side rail buttons dispatch device actions and jump to Status
  tab; selectedSideActionIndex defaults to -1 (nothing active on startup)
- DeviceController registered as QML context property in main.py
- LocalSettings: added status persistence fields
- Theme: added subheadingColor and disabledText
- Added serialcomm/ package and backend data/graph modules
- gitignore: added build/, dist/, *.spec

ISC/Tabs/StatusTab.qml

@@ -18,11 +18,6 @@ ColumnLayout {
     property alias waferCycles: waferCycles.text
     property bool waferDetected: false
 
-    // Latches true once any operation starts (or a previous session is
-    // restored) and never resets, so the status panel stays visible even
-    // when a detect finds no wafer.
-    property bool statusActive: false
-
     // Data summary after parse
     property int dataRows: 0
     property int dataCols: 0
@@ -33,14 +28,14 @@ ColumnLayout {
     Item {
         Layout.fillWidth: true
         Layout.fillHeight: true
-        visible: !root.statusActive
+        visible: !root.waferDetected && !deviceController.operationInProgress
     }
 
     // ===== Results area (shown once detect/operation runs) =====
     ColumnLayout {
         Layout.fillWidth: true
         Layout.fillHeight: true
-        visible: root.statusActive
+        visible: root.waferDetected || deviceController.operationInProgress
         spacing: Theme.rightPaneGap
 
         // --- Connection Status ---
@@ -222,14 +217,7 @@ ColumnLayout {
     // --- Signal Handlers ---
      Connections {
          target: deviceController
-         // Any operation start (detect/read/erase/debug) latches the panel on.
-         function onPortsUpdated() {
-             if (deviceController.operationInProgress)
-                 root.statusActive = true
-         }
-
          function onDetectResult(result) {
-             root.statusActive = true
              if (result && result.familyCode) {
                  root.waferDetected = true
                  waferInfoFamily.text = result.familyCode
@@ -245,7 +233,6 @@ ColumnLayout {
              // Show restored wafer info if available
              var info = deviceController.lastWaferInfo
              if (info && info.length > 0) {
-                 root.statusActive = true
                  root.waferDetected = true
                  waferInfoFamily.text = info[0] || "—"
                  waferSerial.text     = info[1] || "—"
@@ -255,7 +242,6 @@ ColumnLayout {
              }
              // Show data summary if data was previously parsed
              if (deviceController.dataRowCount > 0) {
-                 root.statusActive = true
                  root.dataParsed = true
                  root.dataRows = deviceController.dataRowCount
                  root.dataCols = deviceController.dataColCount