fix Respeaker USB Mic Array v2 LEDs (#357)

Fix ReSpeaker USB LED control and suppress stale peripheral disconnect replay

---------

Co-authored-by: Florian Asche <github@florian-asche.de>

linux_voice_assistant/peripheral_api.py

@@ -281,14 +281,20 @@ class PeripheralAPIServer:
         # Replay the current event state so the client immediately shows the
         # right animation — e.g. a timer ticking animation when reconnecting
         # mid-timer, or the muted indicator when reconnecting while muted.
-        if self._current_state is not None:
-            state_payload: Dict[str, Any] = {"event": self._current_state.value}
-            if self._current_state_data:
-                state_payload["data"] = self._current_state_data
-            try:
-                await websocket.send(json.dumps(state_payload))
-            except Exception:  # pylint: disable=broad-except
-                pass
+        current_state = self._current_state
+        if current_state is None:
+            return
+
+        if current_state == LVAEvent.DISCONNECTED and state.connected:
+            return
+
+        state_payload: Dict[str, Any] = {"event": current_state.value}
+        if self._current_state_data:
+            state_payload["data"] = self._current_state_data
+        try:
+            await websocket.send(json.dumps(state_payload))
+        except Exception:  # pylint: disable=broad-except
+            pass
 
     # ------------------------------------------------------------------
     # Command dispatch