feat(call): Discord-style polish pass (groups A-C)

A — Call core:
- Deafen now implies mute + remembers pre-deafen mic state so un-deafen
  restores it (Discord-parity). Peers still see the headphones-off +
  mic-off badges in sync via the existing data-channel broadcast.
- Self-join sound fires on the local peer's r.connect() too, not just
  on remote ParticipantConnected, so the user gets the "I'm in" cue.
- New CallState.reconnecting holds the UI steady when LiveKit drops the
  signaling socket and retries; duration keeps ticking, status label
  switches to "Verbinde neu…". Full teardown only on terminal
  Disconnected (after LK gives up).
- joinActiveCall falls back to connected after 5s if no peer arrived —
  avoids hanging in "Verbinde…" when peers left the room mid-rejoin.

B — Ringtone:
- Oscillator base gain up (incoming 0.22 -> 0.4, outgoing 0.14 -> 0.22)
  so the default pattern survives laptop speakers + background music.
- New ringtoneVolume slider in Settings, default 0.9, live-applies to
  both the oscillator fallback and the custom-file <audio> element.

C — Participant tile:
- Split the speaking indicator: video tiles get the emerald border +
  inset glow; audio tiles rely on the existing avatar pulse. No more
  double-chrome when someone talks in grid/focus view.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop/src/lib/ringtone.ts

@@ -7,6 +7,7 @@
 // back to the generated oscillator pattern so ringing never misses an
 // incoming call due to an IO failure.
 
+import { getAudioSettings, subscribeAudioSettings } from './audioSettings';
 import { getIncomingRingtone } from './ringtoneStorage';
 
 type Pattern = 'outgoing' | 'incoming';
@@ -21,6 +22,15 @@ class Ringtone {
   private customUrl: string | null = null;
   // Sequence token to ignore slow IO completing after user changed state.
   private startSeq = 0;
+  // Live-subscribe so settings-slider changes reflect while the ringtone
+  // is playing (user can hear the effect of their slider immediately).
+  private unsubVolume: (() => void) | null = null;
+
+  private get volume(): number {
+    const v = getAudioSettings().ringtoneVolume;
+    if (!Number.isFinite(v)) return 0.9;
+    return Math.min(1, Math.max(0, v));
+  }
 
   start(pattern: Pattern): void {
     if (this.pattern === pattern) return; // already playing this pattern
@@ -28,6 +38,12 @@ class Ringtone {
     this.pattern = pattern;
     const seq = ++this.startSeq;
 
+    // Track live slider moves so the user can dial in the volume while a
+    // call is ringing and hear the change immediately.
+    this.unsubVolume = subscribeAudioSettings(() => {
+      if (this.audioEl) this.audioEl.volume = this.volume;
+    });
+
     if (pattern === 'incoming') {
       // Kick off oscillator immediately so we never miss ringing feedback
       // while the custom file (if any) loads asynchronously. Once the blob
@@ -44,6 +60,10 @@ class Ringtone {
     this.stopOscillator();
     this.stopCustom();
     this.pattern = null;
+    if (this.unsubVolume) {
+      this.unsubVolume();
+      this.unsubVolume = null;
+    }
   }
 
   // --- Custom file path (incoming only) ----------------------------------
@@ -61,7 +81,7 @@ class Ringtone {
     const url = URL.createObjectURL(stored.blob);
     const el = new Audio(url);
     el.loop = true;
-    el.volume = 0.85;
+    el.volume = this.volume;
     // Chrome/WKWebView autoplay policy: muted playback is always allowed,
     // but ringtones must be audible, so play() may reject the first time
     // before the user interacted. If it rejects, we keep the oscillator.
@@ -132,25 +152,31 @@ class Ringtone {
     osc.connect(g);
     g.connect(ctx.destination);
     const t0 = ctx.currentTime + delaySec;
+    // Volume slider multiplies the base gain so the fallback tone tracks
+    // the user's preference. A flat user-setting of 0 keeps the pattern
+    // running visually (oscillator nodes alive) but inaudible.
+    const effectiveGain = gain * this.volume;
     g.gain.setValueAtTime(0, t0);
-    g.gain.linearRampToValueAtTime(gain, t0 + 0.02);
+    g.gain.linearRampToValueAtTime(effectiveGain, t0 + 0.02);
     g.gain.exponentialRampToValueAtTime(0.001, t0 + durationSec);
     osc.start(t0);
     osc.stop(t0 + durationSec + 0.02);
   }
 
   private playOutgoing(): void {
-    // Soft calling tone — single warm note.
-    this.beep(440, 0.4, 0, 0.14);
-    this.beep(440, 0.4, 0.6, 0.14);
+    // Soft calling tone — single warm note. Slightly bumped from 0.14 so
+    // it's audible on laptop speakers without blasting.
+    this.beep(440, 0.4, 0, 0.22);
+    this.beep(440, 0.4, 0.6, 0.22);
   }
 
   private playIncoming(): void {
-    // Classic double-ring "ring ring".
-    this.beep(880, 0.18, 0, 0.22);
-    this.beep(660, 0.18, 0.22, 0.22);
-    this.beep(880, 0.18, 0.6, 0.22);
-    this.beep(660, 0.18, 0.82, 0.22);
+    // Classic double-ring "ring ring". Bumped from 0.22 → 0.4 so it's
+    // unmissable through music / background noise.
+    this.beep(880, 0.18, 0, 0.4);
+    this.beep(660, 0.18, 0.22, 0.4);
+    this.beep(880, 0.18, 0.6, 0.4);
+    this.beep(660, 0.18, 0.82, 0.4);
   }
 }