fix: The QML cross-component id resolution for root.waferDetected was failing

silently. Exposing a proper waferDetected property on the Python
DeviceController ensures reliable gating, and resetting it on refresh
blocks the actions until the next successful detection.

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

@@ -44,7 +44,7 @@ ColumnLayout {
                 label: "READ MEMORY"
                 iconSource: "../icons/read.svg"
                 Layout.fillWidth: true
-                enabled: root.waferDetected
+                enabled: deviceController.waferDetected && !deviceController.operationInProgress
                 onClicked: deviceController.readMemoryAsync()
             }
 
@@ -53,7 +53,7 @@ ColumnLayout {
                 iconSource: "../icons/erase.svg"
                 Layout.fillWidth: true
                 destructive: true
-                enabled: root.waferDetected
+                enabled: deviceController.waferDetected && !deviceController.operationInProgress
                 onClicked: deviceController.eraseMemory(
                     deviceController.selectedPort)
             }
@@ -87,6 +87,7 @@ ColumnLayout {
                 label: "REFRESH SESSION"
                 iconSource: "../icons/refresh.svg"
                 Layout.fillWidth: true
+                enabled: !deviceController.operationInProgress
                 onClicked: deviceController.clearSession()
             }