web UI added and refactoring done

python_app/gui/app_window.py

@@ -29,6 +29,7 @@ from python_app.gui.controllers.app_window_plot_mixin import AppWindowPlotMixin
 from python_app.gui.controllers.app_window_preprocess_mixin import AppWindowPreprocessMixin
 from python_app.gui.controllers.app_window_snapshot_mixin import AppWindowSnapshotMixin
 from python_app.gui.controllers.app_window_ui_mixin import AppWindowUiMixin
+from python_app.gui.controllers.app_window_web_mixin import AppWindowWebMixin
 from python_app.gui.preprocess_dialog import PreprocessDialog
 from python_app.models.dataset_model import ResultCollection, SweepCollection
 from python_app.models.gui_profile_model import GuiProfileModel
@@ -53,6 +54,7 @@ class AppWindow(
     AppWindowPipelineMixin,
     AppWindowSnapshotMixin,
     AppWindowControlButtonMixin,
+    AppWindowWebMixin,
     QMainWindow,
 ):
     """Top-level window coordinating GUI state and acquisition runtime."""
@@ -288,6 +290,7 @@ class AppWindow(
         self._timer.start()
         self._maybe_auto_start_pipeline()
         self._start_control_button_watcher()
+        self._init_web_ui()
         if self._is_truthy_env("RADAR_SYSTEM_HEADLESS"):
             self._install_headless_watchdog()
 
@@ -629,6 +632,8 @@ class AppWindow(
             return
         self._closing = True
         try:
+            # 0) Stop the web server first so a late request cannot start work.
+            self._shutdown_web_ui()
             # 0) Stop the GPIO button watcher so a late press cannot start work.
             self._stop_control_button_watcher()
             self._resume_pipeline_after_capture = False