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

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));
+  });
+}