feat: server-side romaji overrides (shared list); preload ExoPlayer from SharedPreferences on cold start

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

src/main.js

@@ -1,6 +1,6 @@
 import { S } from './state.js';
 import { toast } from './utils.js';
-import { api, fetchRomajiIndex } from './api.js';
+import { api, fetchRomajiIndex, loadRomajiOverrides } from './api.js';
 import { injectPWA } from './pwa.js';
 import { loadSavedTheme } from './themes.js';
 import {
@@ -96,6 +96,7 @@ async function startApp() {
     if (bnav) bnav.style.display = '';
     absLoadSettingsLibraries();
   }
+  loadRomajiOverrides().catch(() => {}); // fire-and-forget — cache for dispArtist/dispAlbum/dispTitle
   if (S.cfg.showRomaji) fetchRomajiIndex().catch(() => {}); // fire-and-forget — don't block navigation
   if(_navLoad() && S._navCursor >= 0 && S._navStack[S._navCursor]) {
     const last = S._navStack[S._navCursor];