fix(call): Wave-1 audit fixes (calls host side)

- C-H1: forceState only on FIRST join; on EC reconnect re-arm the fork handlers
  (resendForkState — deafen+quality only) instead of clobbering live mic/video/
  deafen back to the join-time snapshot.
- C-H2: AFK auto-mute reads the fork's io.lotus.call_state VAD of the LOCAL
  published track instead of getUserMedia on the browser DEFAULT mic (which could
  measure silence while the user spoke on another device → auto-mute an active
  speaker). Fails safe (never mutes) when call_state is null OR empty.
- C-H3: control observer re-binds after EC re-renders (body subtree:true + 100ms
  debounce) with an early-return so unchanged state doesn't re-render.
- C-M3 setQuality join-gated; C-M4 hangup 4s fallback dispose (idempotent);
  C-M5 PTT no longer silently un-deafens; C-M6 screenshare-audio mute resets on
  stop; C-L4 deafen key works in the iframe; C-L6 setState-after-unmount guards.

Reviewed (C-H2 [] fail-safe + C-H3 re-render guard applied). tsc/eslint/prettier
clean, build OK, 677 tests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/features/call/CallControls.tsx

@@ -1,4 +1,5 @@
 import React, { MouseEventHandler, useCallback, useEffect, useRef, useState } from 'react';
+import { useSetAtom } from 'jotai';
 import {
   Box,
   Button,
@@ -32,6 +33,7 @@ import {
 import { CallEmbed, useCallControlState } from '../../plugins/call';
 import { useSetting } from '../../state/hooks/settings';
 import { settingsAtom } from '../../state/settings';
+import { callEmbedAtom } from '../../state/callEmbed';
 import { useResizeObserver } from '../../hooks/useResizeObserver';
 import { stopPropagation } from '../../utils/keyboard';
 import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
@@ -48,6 +50,7 @@ type CallControlsProps = {
 export function CallControls({ callEmbed }: CallControlsProps) {
   const controlRef = useRef<HTMLDivElement>(null);
   const callEmbedRef = useCallEmbedRef();
+  const setCallEmbed = useSetAtom(callEmbedAtom);
   const [compact, setCompact] = useState(document.body.clientWidth < 500);
   const [isFullscreen, setIsFullscreen] = useState(false);
 
@@ -175,22 +178,28 @@ export function CallControls({ callEmbed }: CallControlsProps) {
       };
       if (isEditable(target)) return;
       e.preventDefault();
+      // C-M5: mark PTT active BEFORE unmuting so the mic echo (onMediaState)
+      // doesn't treat this transient unmute as a user-initiated undeafen.
+      callEmbed.control.pttActive = true;
       if (!microphoneRef.current) callEmbed.control.setMicrophone(true);
       pttActiveRef.current = true;
       setPttActive(true);
     };
     const onKeyUp = (e: KeyboardEvent) => {
       if (e.code !== pttKey) return;
+      callEmbed.control.pttActive = false;
       callEmbed.control.setMicrophone(false);
       pttActiveRef.current = false;
       setPttActive(false);
     };
     const onBlur = () => {
+      callEmbed.control.pttActive = false;
       callEmbed.control.setMicrophone(false);
       pttActiveRef.current = false;
       setPttActive(false);
     };
     const onFocus = () => {
+      callEmbed.control.pttActive = false;
       callEmbed.control.setMicrophone(false);
       pttActiveRef.current = false;
       setPttActive(false);
@@ -215,6 +224,7 @@ export function CallControls({ callEmbed }: CallControlsProps) {
       iframeWindow?.removeEventListener('focus', onFocus);
       // BUG-8: if callEmbed changes while PTT is active, release mic on cleanup
       if (pttActiveRef.current) {
+        callEmbed.control.pttActive = false;
         callEmbed.control.setMicrophone(false);
         pttActiveRef.current = false;
         setPttActive(false);
@@ -242,8 +252,15 @@ export function CallControls({ callEmbed }: CallControlsProps) {
       e.preventDefault();
       callEmbed.control.toggleSound();
     };
+    // C-L4: also bind the EC iframe window so the deafen key works when focus is
+    // inside the iframe (mirrors the PTT binding above).
+    const iframeWindow = callEmbed.iframe.contentWindow;
     window.addEventListener('keydown', onKeyDown);
-    return () => window.removeEventListener('keydown', onKeyDown);
+    iframeWindow?.addEventListener('keydown', onKeyDown);
+    return () => {
+      window.removeEventListener('keydown', onKeyDown);
+      iframeWindow?.removeEventListener('keydown', onKeyDown);
+    };
   }, [callEmbed, deafenKey]);
 
   const [hangupState, hangup] = useAsyncCallback(
@@ -252,6 +269,19 @@ export function CallControls({ callEmbed }: CallControlsProps) {
   const exiting =
     hangupState.status === AsyncStatus.Loading || hangupState.status === AsyncStatus.Success;
 
+  // C-M4: the normal teardown relies on EC echoing a Close/Hangup action after
+  // it ACKs HangupCall (useCallHangupEvent -> clears callEmbedAtom -> dispose).
+  // If EC ACKs but never echoes, the End button would spin forever. Fall back to
+  // disposing the embed a few seconds after a successful hangup send, unless it
+  // was already torn down by the normal path.
+  useEffect(() => {
+    if (hangupState.status !== AsyncStatus.Success) return undefined;
+    const id = setTimeout(() => {
+      if (!callEmbed.disposed) setCallEmbed(undefined);
+    }, 4000);
+    return () => clearTimeout(id);
+  }, [hangupState.status, callEmbed, setCallEmbed]);
+
   const pttKeyLabel = pttKey === 'Space' ? 'SPACE' : pttKey.replace('Key', '').replace('Digit', '');
 
   return (