feat: admin UX overhaul — status filters, retry/cancel, mobile cards, i18n, shelf pre-populate

- Admin layout: SVG icons, active highlight, divider between nav sections
- Scrape page: status filter pills with counts, text + status combined search
- Audio page: status filter pills, cancel jobs, retry failed jobs, mobile cards for cache tab
- Translation page: status filter pills (incl. cancelled), cancel + retry jobs, mobile cancel/retry cards, i18n for all labels
- AI Jobs page: fix concurrent cancel (Set instead of single slot), per-job cancel errors inline, full mobile card layout, i18n title/heading
- Text-gen page: tagline editable input + copy, warnings copy, i18n title/heading
- Book page: chapter cover Save button, audio monitor link, currentShelf pre-populated from server
- pocketbase.ts: add getBookShelf(), shelf field on UserLibraryEntry
- New API route: POST /api/admin/translation/bulk (proxy for translation retry)
- i18n: 15 new admin_translation_*, admin_ai_jobs_*, admin_text_gen_* keys across all 5 locales

backend/cmd/backend/main.go

@@ -179,24 +179,25 @@ func run() error {
 			Commit:       commit,
 		},
 		backend.Dependencies{
-			BookReader:       store,
-			RankingStore:     store,
-			AudioStore:       store,
-			TranslationStore: store,
-			PresignStore:     store,
-			ProgressStore:    store,
-			CoverStore:       store,
-			Producer:         producer,
-			TaskReader:       store,
-			SearchIndex:      searchIndex,
-			Kokoro:           kokoroClient,
-			PocketTTS:        pocketTTSClient,
-			CFAI:             cfaiClient,
-			ImageGen:         imageGenClient,
-			TextGen:          textGenClient,
-			BookWriter:       store,
-			AIJobStore:       store,
-			Log:              log,
+			BookReader:        store,
+			RankingStore:      store,
+			AudioStore:        store,
+			TranslationStore:  store,
+			PresignStore:      store,
+			ProgressStore:     store,
+			CoverStore:        store,
+			ChapterImageStore: store,
+			Producer:          producer,
+			TaskReader:        store,
+			SearchIndex:       searchIndex,
+			Kokoro:            kokoroClient,
+			PocketTTS:         pocketTTSClient,
+			CFAI:              cfaiClient,
+			ImageGen:          imageGenClient,
+			TextGen:           textGenClient,
+			BookWriter:        store,
+			AIJobStore:        store,
+			Log:               log,
 		},
 	)