initial

apps/desktop/src/lib/notificationSound.ts

@@ -0,0 +1,45 @@
+// Two-tone notification chime generated via WebAudio. No asset file needed.
+// Throttled so a burst of messages doesn't turn into a machine gun.
+
+let lastPlay = 0;
+
+export function playNotificationTone(): void {
+  const now = Date.now();
+  if (now - lastPlay < 800) return;
+  lastPlay = now;
+
+  const AudioCtx =
+    window.AudioContext ??
+    (window as unknown as { webkitAudioContext?: typeof AudioContext }).webkitAudioContext;
+  if (!AudioCtx) return;
+
+  const ctx = new AudioCtx();
+  const master = ctx.createGain();
+  master.connect(ctx.destination);
+  master.gain.value = 0.12;
+
+  const tones: { freq: number; delay: number }[] = [
+    { freq: 880, delay: 0 },
+    { freq: 1320, delay: 0.08 },
+  ];
+  for (const { freq, delay } of tones) {
+    const osc = ctx.createOscillator();
+    const gain = ctx.createGain();
+    osc.type = 'sine';
+    osc.frequency.value = freq;
+    osc.connect(gain);
+    gain.connect(master);
+    const t0 = ctx.currentTime + delay;
+    gain.gain.setValueAtTime(0, t0);
+    gain.gain.linearRampToValueAtTime(1, t0 + 0.015);
+    gain.gain.exponentialRampToValueAtTime(0.001, t0 + 0.28);
+    osc.start(t0);
+    osc.stop(t0 + 0.3);
+  }
+
+  window.setTimeout(() => {
+    void ctx.close().catch(() => {
+      /* ignore */
+    });
+  }, 600);
+}