refactor(calls): drop the deafen iframe-DOM fallback now that the fork owns it (#209)

CallControl.setSound()/applyScreenshareAudioMuted() no longer poke <audio>.muted
inside the EC frame, and the per-membership re-apply (useCallMemberSoundSync)
is gone: with the pin at 0.25.0-lotus.4 the fork applies deafen and the
screenshare-audio mute through its own renderer, including for late joiners.
Verified headless: deafen set before a second participant joins mutes their
track on arrival; deafen/undeafen leaves the screenshare-audio mute in place.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/components/CallEmbedProvider.tsx

@@ -34,7 +34,6 @@ import {
   useCallHangupEvent,
   useCallJoined,
   useCallThemeSync,
-  useCallMemberSoundSync,
   useCallStart,
 } from '../hooks/useCallEmbed';
 import { callChatAtom, callEmbedAtom } from '../state/callEmbed';
@@ -673,7 +672,6 @@ function CallUtils({ embed, joined }: { embed: CallEmbed; joined: boolean }) {
   // the mobile in-call chat. Both are gated on `joined`.
   useCallHotkeys(embed, joined);
   useAfkAutoMute(joined ? embed : undefined);
-  useCallMemberSoundSync(embed);
   useCallJoinLeaveSounds(embed);
   useCallThemeSync(embed);
   useCallQuality(embed);

src/app/hooks/useCallEmbed.ts

@@ -13,7 +13,6 @@ import { ThemeKind, useTheme } from './useTheme';
 import { callEmbedAtom } from '../state/callEmbed';
 import { useResizeObserver } from './useResizeObserver';
 import { CallControlState } from '../plugins/call/CallControlState';
-import { useCallMembersChange, useCallSession } from './useCall';
 import { CallPreferences } from '../state/callPreferences';
 import { useSetting } from '../state/hooks/settings';
 import { NoiseSuppressionMode, settingsAtom } from '../state/settings';
@@ -184,14 +183,6 @@ export const useCallHangupEvent = (embed: CallEmbed, callback: () => void) => {
   useClientWidgetApiEvent(embed.call, ElementWidgetActions.Close, callback);
 };
 
-export const useCallMemberSoundSync = (embed: CallEmbed) => {
-  const callSession = useCallSession(embed.room);
-  useCallMembersChange(
-    callSession,
-    useCallback(() => embed.control.applySound(), [embed]),
-  );
-};
-
 export const useCallThemeSync = (embed: CallEmbed) => {
   const theme = useTheme();
 

src/app/plugins/call/CallControl.ts

@@ -159,7 +159,7 @@ export class CallControl extends EventEmitter implements CallControlState {
       audio_enabled: this.microphone,
       video_enabled: this.video,
     });
-    this.setSound(this.sound);
+    this.setSound();
     this.emitStateUpdate();
   }
 
@@ -251,10 +251,6 @@ export class CallControl extends EventEmitter implements CallControlState {
     this.onControlMutation();
   }
 
-  public applySound() {
-    this.setSound(this.sound);
-  }
-
   private async setMediaState(state: ElementMediaStatePayload) {
     // transport.send resolves once EC has ACK'd the command, which is enough to
     // consider the mute applied. We deliberately do NOT gate completion on a
@@ -265,33 +261,22 @@ export class CallControl extends EventEmitter implements CallControlState {
     return this.call.transport.send(ElementWidgetActions.DeviceMute, state);
   }
 
-  private setSound(sound: boolean): void {
-    const callDocument = getCallDocument(this.iframe);
-    if (callDocument) {
-      callDocument.querySelectorAll('audio').forEach((el) => {
-        const isScreenshareAudio = el.getAttribute('data-lk-source') === 'screen_share_audio';
-        el.muted = !sound || (isScreenshareAudio && this.screenshareAudioMuted);
-      });
-    }
+  // [Gitea #209] Deafen is applied by the fork (io.lotus.set_deafen). The
+  // iframe-DOM `.muted` fallback that used to live here (plus the per-member
+  // re-apply in useCallMemberSoundSync) fought EC's audio renderer and is gone
+  // now that the pin is ≥ 0.25.0-lotus.2 — late joiners are the fork's job.
+  private setSound(): void {
     this.sendDeafenState();
   }
 
   private applyScreenshareAudioMuted(): void {
     if (!this.sound) return;
-    const callDocument = getCallDocument(this.iframe);
-    if (callDocument) {
-      callDocument
-        .querySelectorAll<HTMLAudioElement>('audio[data-lk-source="screen_share_audio"]')
-        .forEach((el) => {
-          el.muted = this.screenshareAudioMuted;
-        });
-    }
     this.sendDeafenState();
   }
 
-  // P6-2: send deafen state to the fork (io.lotus.set_deafen). The DOM .muted
-  // code above is a transitional fallback — remove once the fork ships & the
-  // pin is bumped.
+  // P6-2: send deafen state to the fork (io.lotus.set_deafen). Join-gated: the
+  // fork's handler only exists once joined; onCallJoined() re-sends the current
+  // state so a pre-join deafen is not lost.
   private sendDeafenState(): void {
     if (!this.joined) return;
     this.call.transport
@@ -398,7 +383,7 @@ export class CallControl extends EventEmitter implements CallControlState {
     );
     this.state = state;
 
-    this.setSound(sound);
+    this.setSound();
     // After un-deafening, re-apply screenshare audio mute if active
     if (sound) this.applyScreenshareAudioMuted();