fix(calls): no stale "muted + deafened" render when a call starts

useCallControlState kept the previous control's state (the all-off
default before a call) for one render after the control changed, until
its effect caught up. The thumbbar, SMTC and tray hooks pushed that render
to the OS, so every join flashed "muted + deafened" first (recorded:
idle → active+muted+deafened → active). The state now remembers which
control it belongs to and reads the new control directly when they differ
(now: idle → active).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/plugins/call/hooks.ts

@@ -35,20 +35,29 @@ export const useSendClientWidgetApiAction = (api: ClientWidgetApi) => {
 const DEFAULT_CONTROL_STATE = new CallControlState(false, false, false);
 
 export const useCallControlState = (control: CallControl | undefined): CallControlState => {
-  const [state, setState] = useState(control?.getState() ?? DEFAULT_CONTROL_STATE);
+  // Remember which control the stored state came from. When a call starts the
+  // control changes, and the effect below only catches up after a render; until
+  // then the old (default: all off) state would be returned for the NEW call —
+  // one render of "muted + deafened" that the thumbbar, SMTC and tray (#4)
+  // pushed to the OS as a flicker. Read the new control directly instead.
+  const [entry, setEntry] = useState(() => ({
+    control,
+    state: control?.getState() ?? DEFAULT_CONTROL_STATE,
+  }));
 
   useEffect(() => {
     if (!control) {
-      setState(DEFAULT_CONTROL_STATE);
+      setEntry({ control, state: DEFAULT_CONTROL_STATE });
       return;
     }
-    setState(control.getState());
+    setEntry({ control, state: control.getState() });
-    const handleUpdate = () => setState(control.getState());
+    const handleUpdate = () => setEntry({ control, state: control.getState() });
     control.on(CallControlEvent.StateUpdate, handleUpdate);
     return () => {
       control.off(CallControlEvent.StateUpdate, handleUpdate);
     };
   }, [control]);
 
-  return state;
+  if (entry.control !== control) return control?.getState() ?? DEFAULT_CONTROL_STATE;
+  return entry.state;
 };