added data saving feature

python_app/gui/app_window.py

@@ -25,6 +25,7 @@ from python_app.gui.controllers.app_window_config_mixin import AppWindowConfigMi
 from python_app.gui.controllers.app_window_control_button_mixin import AppWindowControlButtonMixin
 from python_app.gui.controllers.app_window_pipeline_mixin import AppWindowPipelineMixin
 from python_app.gui.controllers.app_window_plot_mixin import AppWindowPlotMixin
+from python_app.gui.controllers.app_window_recording_mixin import AppWindowRecordingMixin
 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
@@ -96,6 +97,7 @@ class AppWindow(
     AppWindowPlotMixin,
     AppWindowPipelineMixin,
     AppWindowSnapshotMixin,
+    AppWindowRecordingMixin,
     AppWindowControlButtonMixin,
     AppWindowWebMixin,
     QMainWindow,
@@ -114,6 +116,7 @@ class AppWindow(
         self._init_preprocess_state()
         self._init_capture_state()
         self._init_history_state()
+        self._init_recording_state()
         self._init_runtime_limits()
         self._init_polling_timer()
         self._init_control_button_state()
@@ -676,9 +679,27 @@ class AppWindow(
             return max(0, int(raw_value))
         return 0
 
+    def _capture_web_action_error(self, message: str) -> bool:
+        """Record the first error of an in-flight web action so the browser can show it.
+
+        Returns ``True`` if a web-triggered action is currently running (see
+        ``AppWindowWebMixin._run_web_action``). Callers use that to skip the blocking
+        desktop modal for web errors — the browser shows the message instead, and the
+        operator at the browser must not have to dismiss a popup on the (often headless)
+        host before the HTTP response returns. Desktop-only errors are unaffected.
+        """
+        capture = getattr(self, "_web_action_error_capture", None)
+        if capture is None:
+            return False
+        if not capture:
+            capture.append(message)
+        return True
+
     def _show_error(self, message: str, *, details: str | None = None) -> None:
         """Log and present an error in a modal dialog with optional detail text."""
         self._log_error(message, details=details)
+        if self._capture_web_action_error(message):
+            return  # web-triggered: surfaced to the browser; no blocking desktop modal
         if self._is_truthy_env("RADAR_SYSTEM_HEADLESS"):
             return
         dialog = QMessageBox(self)
@@ -692,6 +713,8 @@ class AppWindow(
     def _show_exception(self, context: str, exc: Exception) -> None:
         """Log full exception details and show modal dialog with expandable traceback."""
         message, details = self._log_exception(context, exc, level="ERROR")
+        if self._capture_web_action_error(message):
+            return  # web-triggered: surfaced to the browser; no blocking desktop modal
         if self._is_truthy_env("RADAR_SYSTEM_HEADLESS"):
             return
         dialog = QMessageBox(self)
@@ -717,6 +740,8 @@ class AppWindow(
         try:
             # 0) Stop the web server first so a late request cannot start work.
             self._shutdown_web_ui()
+            # 0) Stop the disk-recording writer thread so it is not orphaned.
+            self._shutdown_recording()
             # 0) Stop the GPIO button watcher so a late press cannot start work.
             self._stop_control_button_watcher()
             self._resume_pipeline_after_capture = False