fix(mobile): prevent crash when restoring a saved playback queue

apps/mobile/src/player/controller.ts

@@ -20,6 +20,7 @@ import { playerCache, qualityPrefs, type Quality } from '../lib/prefs';
 import { downloads } from '../offline/downloads';
 import { PersistentEvents } from '../offline/events';
 import { offlineWave } from './offlineWave';
+import { eventId } from './eventId';
 
 export { offlineWave };
 
@@ -113,7 +114,7 @@ class Controller {
     this.server = server;
     this.persistent = session && userId ? new PersistentEvents(session, server, userId) : null;
     const sink = this.persistent;
-    this.events = sink ? new EventBuffer({ send: sink.send }) : null;
+    this.events = sink ? new EventBuffer({ send: sink.send }, Date.now, undefined, eventId) : null;
     void sink?.drain();
     this.unsubscribeNet ??= NetInfo.addEventListener((st) => {
       if (st.isConnected) void this.persistent?.drain();

apps/mobile/src/player/eventId.ts

@@ -0,0 +1,9 @@
+import { uuidv7 } from '@pipu/core';
+
+/** Hermes has no Web Crypto. Expo's installed native runtime supplies secure UUID randomness. */
+export function eventId(now: number): string {
+  return uuidv7(now, () => {
+    const hex = globalThis.expo.uuidv4().replace(/-/g, '');
+    return Uint8Array.from(hex.match(/../g)!, (byte) => parseInt(byte, 16));
+  });
+}

apps/mobile/test/eventId.test.ts

@@ -0,0 +1,19 @@
+import { afterEach, expect, it, vi } from 'vitest';
+import { EventBuffer } from '@pipu/core';
+import { eventId } from '../src/player/eventId';
+
+afterEach(() => vi.unstubAllGlobals());
+
+it('queues restored-track events on Hermes without Web Crypto', () => {
+  vi.stubGlobal('crypto', undefined);
+  const nativeUuid = vi.fn()
+    .mockReturnValueOnce('00000000-0000-4fff-bfff-ffffffffffff')
+    .mockReturnValueOnce('00000000-0000-4fff-bfff-fffffffffffe');
+  vi.stubGlobal('expo', { uuidv4: nativeUuid });
+  const buffer = new EventBuffer({ send: vi.fn() }, () => 0x0190_0000_0000, undefined, eventId);
+  buffer.push({ type: 'play_start', track_id: 'restored-track' });
+  buffer.push({ type: 'skip', track_id: 'restored-track' });
+  expect(buffer.pending[0]?.id).toBe('01900000-0000-7fff-bfff-ffffffffffff');
+  expect(buffer.pending[1]?.id).not.toBe(buffer.pending[0]?.id);
+  expect(nativeUuid).toHaveBeenCalledTimes(2);
+});