fix: disconnect signals and config callbacks on destroy

- dock/main.py: off_config_change in destroy()
- switcher/main.py: add destroy() for capture signals + config
- panel/main.py: disconnect fullscreen-changed signal
- notification_center.py: add destroy() for 4 notification signals

src/window/dock/main.py

@@ -176,6 +176,9 @@ class Dock(Window):
     def destroy(self) -> None:
         self._destroyed = True
         self._disconnect_occlusion_signals()
+        from services.config import off_config_change
+
+        off_config_change(self._on_config_change)
 
         if hasattr(self, "canvas") and self.canvas:
             self.canvas.destroy()

src/window/notification/notification_center.py

@@ -1003,6 +1003,16 @@ class NotificationCenter(AppletWindow):
     def _on_escape_pressed(self, *_):
         self.hide()
 
+    def destroy(self) -> None:
+        try:
+            notification_service.disconnect_by_func(self.on_notification_added)
+            notification_service.disconnect_by_func(self.on_notification_removed)
+            notification_service.disconnect_by_func(self.on_clear_all)
+            notification_service.disconnect_by_func(self.on_count_changed)
+        except Exception:
+            pass
+        super().destroy()
+
     def set_visible(self, visible: bool):
         """Control notification center visibility with slide-left animation"""
         super().set_visible(visible)

src/window/panel/main.py

@@ -383,6 +383,7 @@ class Panel(Window):
         """Clean up all signals and components"""
         try:
             modus_service.disconnect_by_func(self.on_dnd_changed)
+            modus_service.disconnect_by_func(self._on_fullscreen_changed)
             notification_service.disconnect_by_func(self.on_notification_count_changed)
             from services.config import off_config_change
 

src/window/switcher/main.py

@@ -578,6 +578,17 @@ class ApplicationSwitcher(Window):
         except Exception:
             logger.exception("_on_frame_ready error")
 
+    def destroy(self) -> None:
+        from services.config import off_config_change
+
+        off_config_change(self._on_config_changed)
+        try:
+            self._capture.disconnect_by_func(self._on_frame_ready)
+            self._capture.disconnect_by_func(self._on_frame_failed)
+        except Exception:
+            pass
+        super().destroy()
+
     def _on_frame_failed(self, _capture, addr, reason):
         full_addr = addr if addr.startswith("0x") else f"0x{addr}"
         logger.debug(f"AppCapture frame-failed for {full_addr}: {reason}")