fix: eliminate guaranteed 404s (ru menaion-bundle, unmapped commemorations)

- loadMenaionBundle: ru resolves to cu bundle (no RU liturgical texts by design)
- autoPreload: fetch cu bundle once; keep ru+cu lives for current month
- calendar view: fetch shared commemorations only for mapped feast CIds

src/ui/app.ts

@@ -109,9 +109,12 @@ export class App {
       const key = 'ponomar-preloaded';
       if (localStorage.getItem(key)) return;
       const lang = this.settings.language as LanguageCode;
-      const languages = lang === 'ru' ? ['ru', 'cu'] : [lang];
-      for (const l of languages) {
+      const liturgicalLangs = lang === 'ru' || lang === 'cu' ? ['cu'] : [lang];
+      for (const l of liturgicalLangs) {
         await DataCache.fetch(`/data/${l}/menaion-bundle.json`).catch(() => {});
+      }
+      const livesLangs = lang === 'ru' ? ['ru', 'cu'] : [lang];
+      for (const l of livesLangs) {
         const mm = String(JDate.today().getMonth()).padStart(2, '0');
         await DataCache.fetch(`/data/${l}/lives/${mm}.json`).catch(() => {});
       }

src/ui/calendar-view.ts

@@ -108,7 +108,7 @@ async function loadSharedScriptureIndex(): Promise<Record<string, unknown[]> | n
 }
 
 async function loadMenaionBundle(lang: string): Promise<Record<string, unknown> | null> {
-  const key = lang === 'cu' ? 'cu' : lang;
+  const key = lang === 'ru' || lang === 'cu' ? 'cu' : lang;
   if (menaionBundles.has(key)) return menaionBundles.get(key)!;
   try {
     const bundle = await DataCache.fetch<Record<string, unknown>>(`/data/${key}/menaion-bundle.json`);
@@ -698,9 +698,10 @@ export class CalendarView {
     const sharedComms: Map<string, CommemorationData> = new Map();
     
     for (const cid of cids.slice(0, 30)) {
+      const sharedId = CID_TO_SHARED_COMM[cid];
       const [life, shared] = await Promise.all([
         loadLife(this.language, cid),
-        loadCommemoration(CID_TO_SHARED_COMM[cid] || cid),
+        sharedId ? loadCommemoration(sharedId) : Promise.resolve(null),
       ]);
       if (life) livesData.set(cid, life);
       if (shared) sharedComms.set(cid, shared);