fix(calls): undeafen restores the microphone it muted (#173)

Deafen muted the mic (correct) but undeafen left you muted, so every
deafen cycle silently turned into a mute. Remember whether the mic was on
when deafening and turn it back on when undeafening (Discord semantics).
Verified in a real two-party LiveKit call on the local stack.

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

src/app/plugins/call/CallControl.ts

@@ -50,6 +50,11 @@ export class CallControl extends EventEmitter implements CallControlState {
   // user-initiated unmute that auto-undeafens the user.
   public pttActive = false;
 
+  // Deafen mutes the mic; undeafen should give it back ONLY if it was on
+  // before (Discord semantics — verified against the real client, Gitea #173:
+  // undeafen used to leave you muted). Cleared by any manual mic toggle.
+  private micOnBeforeDeafen = false;
+
   // P6-2: mirrors CallEmbed.joined. Set true from forceState(), which CallEmbed
   // invokes only from onCallJoined(). Gates io.lotus.set_deafen so we never send
   // before the fork's widget handler mounts (pre-join sends pend to a 10s
@@ -398,7 +403,11 @@ export class CallControl extends EventEmitter implements CallControlState {
 
     this.emitStateUpdate();
 
-    if (!this.sound && this.microphone) {
+    if (!sound) {
+      this.micOnBeforeDeafen = this.microphone;
+      if (this.microphone) this.toggleMicrophone();
+    } else if (this.micOnBeforeDeafen && !this.microphone) {
+      this.micOnBeforeDeafen = false;
       this.toggleMicrophone();
     }
   }