feat(soundboard): hotkeys fire outside calls with local-only playback

Lifts the `state.kind === 'connected'` guard from the soundboard hotkey
useEffect so OS-level shortcuts are always registered. Inside a call the
existing `playSoundboard` path routes audio into the LiveKit pipeline so
peers hear; outside a call the new `playSoundboardLocal` helper fetches
the blob via `getSoundBlob`, creates a short-lived object URL, and plays
through a fresh HTMLAudioElement on the system default output.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/desktop/src/lib/soundboardLocalPlay.ts

@@ -0,0 +1,44 @@
+// Plays a soundboard entry to the local default audio output. Used when no
+// call pipeline is active (the in-call path routes via the LiveKit
+// publishing pipeline so peers hear; this path is local-only). Fetches the
+// blob via getSoundBlob and creates a short-lived object URL for the audio
+// element.
+
+import { getSoundBlob, type SoundboardEntry } from './soundboardStorage';
+
+const activeAudios = new Set<HTMLAudioElement>();
+
+export async function playSoundboardLocal(entry: SoundboardEntry): Promise<void> {
+  const blob = await getSoundBlob(entry.id);
+  if (!blob) return;
+  const src = URL.createObjectURL(blob);
+  const el = new Audio(src);
+  // Use the per-entry gain as local volume. SoundboardEntry exposes `gain`
+  // (0..1) which mirrors the value used in the in-call pipeline.
+  el.volume = Math.max(0, Math.min(1, entry.gain));
+  activeAudios.add(el);
+  const cleanup = () => {
+    activeAudios.delete(el);
+    URL.revokeObjectURL(src);
+  };
+  el.addEventListener('ended', cleanup);
+  el.addEventListener('error', cleanup);
+  try {
+    await el.play();
+  } catch (err) {
+    cleanup();
+    console.warn('soundboardLocalPlay failed', err);
+  }
+}
+
+export function stopSoundboardLocal(): void {
+  for (const el of activeAudios) {
+    try {
+      el.pause();
+      el.currentTime = 0;
+    } catch {
+      /* ignore */
+    }
+  }
+  activeAudios.clear();
+}