fix(qml): resolve runtime reference errors, missing imports, and port change notifications

src/pygui/__main__.py

@@ -9,12 +9,22 @@ from PySide6.QtWidgets import QApplication
 
 from pygui.backend.controllers.device_controller import DeviceController
 from pygui.backend.controllers.session_controller import SessionController
+from pygui.backend.data.constants import default_data_dir
 from pygui.backend.data.file_browser import FileBrowser
 from pygui.backend.data.local_settings import LocalSettings
 from pygui.backend.data.local_settings_model import LocalSettingsModel
 from pygui.backend.license.license_model import LicenseModel
 
 # Importing wafer_map_item + trend_chart_item registers @QmlElement types (QML: import ISC.Wafer).
+from pygui.backend.visualization import (
+    graph_quick_item as graph_quick_item,  # noqa: F401
+)
+from pygui.backend.visualization import (
+    trend_chart_item as trend_chart_item,  # noqa: F401
+)
+from pygui.backend.visualization import (
+    wafer_map_item as wafer_map_item,  # noqa: F401
+)
 
 
 # ===== Application Entry Point =====
@@ -32,8 +42,15 @@ def main() -> int:
     app = QApplication(sys.argv)
     engine = QQmlApplicationEngine()
 
-    # ===== Shared Models =====
-    settings_model = LocalSettingsModel()
+    # ===== Shared Settings =====
+    # One LocalSettings instance, one disk read. LocalSettingsModel and
+    # DeviceController both hold this same object, so a save from the
+    # Settings tab is visible to the device layer immediately — no reload,
+    # no second copy to go stale.
+    data_dir = str(default_data_dir())
+    raw_settings = LocalSettings.read_settings(data_dir)
+
+    settings_model = LocalSettingsModel(raw_settings, data_dir)
     select_file_dialog_model = FileBrowser()
     settings_model.loadSettings()
     engine.rootContext().setContextProperty("settingsModel", settings_model)
@@ -54,8 +71,6 @@ def main() -> int:
     #   read/erase time (P2.1); a bound Callable[[str], str] avoids a
     #   LicenseModel import in the controller and keeps it testable with a
     #   lambda. See docs/pending/license-gating-plan.md §1.1.
-    data_dir = str(settings_model._data_dir)
-    raw_settings = LocalSettings.read_settings(data_dir)
     device_controller = DeviceController(raw_settings, data_dir)
     engine.rootContext().setContextProperty("deviceController", device_controller)
 
@@ -64,20 +79,9 @@ def main() -> int:
     engine.rootContext().setContextProperty("licenseModel", license_model)
 
     # ===== Session Controller (live/review wafer dashboard) =====
-    raw_settings_dict = raw_settings.__dict__.copy() if hasattr(raw_settings, '__dict__') else {}
-    stream_controller = SessionController(settings=raw_settings_dict)
+    stream_controller = SessionController()
     engine.rootContext().setContextProperty("streamController", stream_controller)
 
-    # Persist session state back to settings when it changes
-    def _persist_session_settings():
-        session_state = stream_controller.collect_settings()
-        for k, v in session_state.items():
-            if hasattr(raw_settings, k):
-                setattr(raw_settings, k, v)
-        LocalSettings.save_settings(data_dir, raw_settings)
-
-    stream_controller.settingsChanged.connect(_persist_session_settings)
-
     # ===== 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.