Refactor code structure for improved readability and maintainability

src/pygui/__main__.py

@@ -9,7 +9,9 @@ from pygui.backend.device_controller import DeviceController
 from pygui.backend.local_settings import LocalSettings
 from pygui.backend.local_settings_model import LocalSettingsModel
 from pygui.backend.file_browser import FileBrowser
-
+from pygui.backend.session_controller import SessionController
+# Importing wafer_map_item registers the @QmlElement WaferMapItem (QML: import ISC.Wafer).
+from pygui.backend.wafer_map_item import WaferMapItem
 
 # ===== Application Entry Point =====
 def main() -> int:
@@ -35,6 +37,10 @@ def main() -> int:
     device_controller = DeviceController(raw_settings, data_dir)
     engine.rootContext().setContextProperty("deviceController", device_controller)
 
+    # ===== Session Controller (live/review wafer dashboard) =====
+    stream_controller = SessionController()
+    engine.rootContext().setContextProperty("streamController", stream_controller)
+
     # ===== QML Startup =====
     # The "ISC" QML module lives alongside this file (src/pygui/ISC), so the
     # package directory is the import path the engine searches for qmldir.