fix: re-apply desired device state after EC joins, support mid-call PTT

src/app/features/call/CallControls.tsx

@@ -58,6 +58,15 @@ export function CallControls({ callEmbed }: CallControlsProps) {
   const [pttKey] = useSetting(settingsAtom, 'pttKey');
   const [pttActive, setPttActive] = useState(false);
 
+  // Mute mic immediately when PTT is enabled mid-call so the key handler can activate
+  const pttModeRef = useRef(pttMode);
+  useEffect(() => {
+    if (pttMode && !pttModeRef.current && microphone) {
+      callEmbed.control.setMicrophone(false);
+    }
+    pttModeRef.current = pttMode;
+  }, [pttMode, callEmbed, microphone]);
+
   const handleOpenMenu: MouseEventHandler<HTMLButtonElement> = (evt) => {
     setCords(evt.currentTarget.getBoundingClientRect());
   };