feat: serve all precached data offline via DataCache fallback

- DataCache.fetchWithFallback: network-first with IDB write-through under
  the same url: keys the preload writes; falls back to precached IDB copy
  when offline — closes the preload(IDB) vs read(SW cache) gap that made
  the Bible reader (and every other view) fail offline despite precaching
- Convert all 33 raw /data fetches across bible/service/menaion/prayer/
  calendar/settings views; in-memory caches and notFound maps preserved
- fetchCommandText: switch to lowercase services/commands/ (already in
  preload manifest); tolerate both TEXT/text node casings per migrate-data
- Remove stale duplicate static/data/en/services/Command/ (15 files)
- fetchLives: fix misc fallback to real lives/misc/{N}.json bundles

src/ui/settings-view.ts

@@ -326,8 +326,8 @@ export class SettingsView {
     // Load default Bible versions dynamically
     (async () => {
       try {
-        const resp = await fetch('/data/bible/versions.json');
-        const versions = await resp.json();
+        const versions = await DataCache.fetchWithFallback<any[]>('/data/bible/versions.json');
+        if (!versions || !Array.isArray(versions)) return;
         const userLang = this.settings.language;
 
         // Sort by language priority
@@ -479,8 +479,8 @@ export class SettingsView {
         // Load translations on first expand
         if (container.innerHTML === '') {
           try {
-            const resp = await fetch('/data/bible/versions.json');
-            const versions = await resp.json();
+            const versions = await DataCache.fetchWithFallback<any[]>('/data/bible/versions.json');
+            if (!versions || !Array.isArray(versions)) throw new Error('unavailable');
             const userLang = this.settings.language;
             versions.sort((a: any, b: any) => {
               const pa = versionPriority(a.language, userLang);
@@ -637,8 +637,8 @@ export class SettingsView {
       // Count cached Bible translations
       (async () => {
         try {
-          const resp = await fetch('/data/bible/versions.json');
-          const versions = await resp.json();
+          const versions = await DataCache.fetchWithFallback<any[]>('/data/bible/versions.json');
+          if (!versions || !Array.isArray(versions)) return;
           const total = versions.length;
           let cached = 0;
           for (const v of versions) {