fix(services/spotlight): improve MPRIS artwork handling and scope keyword searches to single plugin

- mpris: native MediaArt cache lookup, dedupe play/pause emission, safe
  cleanup, artwork polling for already-playing browser players, drop
  os.system seek fallback
- spotlight: scope plugin keyword and detect() matches to a single plugin
  via search_single instead of global search; register clipboard keywords
  (clip/clipboard)

src/window/panel/main.py

@@ -69,12 +69,6 @@ class Panel(Window):
         self.tray.connect("add", self._update_tray_visibility)
         self.tray.connect("remove", self._update_tray_visibility)
 
-        self.indicators = Box(
-            name="indicators",
-            orientation="h",
-            spacing=4,
-        )
-
         self._spotlight_toggle_cb = None
         self.search = Button(
             name="panel-button",

src/window/panel/notch/indicators.py

@@ -334,9 +334,24 @@ class MicrophoneIndicator(Box):
             self._connect_mic_signals()
 
     def _connect_mic_signals(self):
-        if self._audio.microphone:
-            self._audio.microphone.connect("changed", self._on_mic_stream_changed)
-            self._sync_state()
+        mic = self._audio.microphone
+        if mic is None:
+            return
+        # Disconnect from a previously-connected device if it changed, and
+        # avoid stacking duplicate handlers on the same device.
+        old = getattr(self, "_mic_device", None)
+        if old is not None and old is not mic:
+            try:
+                old.disconnect_by_func(self._on_mic_stream_changed)
+            except Exception:
+                pass
+        try:
+            mic.disconnect_by_func(self._on_mic_stream_changed)
+        except Exception:
+            pass
+        mic.connect("changed", self._on_mic_stream_changed)
+        self._mic_device = mic
+        self._sync_state()
 
     def _on_mic_device_changed(self, *_):
         self._connect_mic_signals()
@@ -371,8 +386,13 @@ class MicrophoneIndicator(Box):
             self._hide_timer_id = 0
         try:
             self._audio.disconnect_by_func(self._on_mic_device_changed)
-            if self._audio.microphone:
-                self._audio.microphone.disconnect_by_func(self._on_mic_stream_changed)
-        except Exception as e:
-            logger.warning(f"[NotchIndicators] mic disconnect: {e}")
+        except Exception:
+            pass
+        old = getattr(self, "_mic_device", None)
+        target = old if old is not None else self._audio.microphone
+        if target is not None:
+            try:
+                target.disconnect_by_func(self._on_mic_stream_changed)
+            except Exception as e:
+                logger.warning(f"[NotchIndicators] mic disconnect: {e}")
         super().destroy()

src/window/panel/notch/notch.py

@@ -188,6 +188,12 @@ class Notch(Box):
     def _on_player_vanish(self, _manager, name: str):
         if name in self._music_services:
             self._music_services.remove(name)
+            try:
+                svc = self._mpris.get_player_service(name)
+                if svc is not None:
+                    svc.disconnect_by_func(self._on_any_artwork)
+            except Exception:
+                pass
             self._apply_stack_state()
 
     # ── Scroll ────────────────────────────────────────────────────────────────