feat(backend): Phase 2 complete — bookshelf-api + ABS, remove OPDS/Gutenberg/LocalFolder/CloudSync
Phase 2.4: download/open ebooks from server
- BookshelfViewModel now extends AndroidViewModel, downloads books via BookshelfApiRepository.downloadEbook
- Saves to cache dir, emits Uri via SharedFlow, opens in reader via MainViewModel.onFileSelected
- Download progress indicator in BookshelfLibraryScreen item cards
Phase 2.5: remove legacy backends
- Delete reader/opds/ package (OpdsModels, OpdsParser, OpdsRepository, OpdsViewModel)
- Delete CloudSyncTrace.kt and FolderSyncWorker.kt
- Delete OpdsTab, rememberOpdsCoverImageLoader, OpdsCatalogCard, OpdsNavigationCard, OpdsBookCard, OpdsBookDetailsSheet from LibraryScreen
- Delete FolderSyncScreen, FolderCard, EditFolderFiltersDialog from LibraryScreen
- Remove 'Catalogs' tab from LibraryScreen tabTitles
- Add CloudSyncTraceStub.kt with no-op stubs for logCloudSyncTrace/Error/Annotation variants
- Add FolderSyncWorkerStub.kt as no-op CoroutineWorker with constants
- Fix OpdsStreamDocumentWrapper to use plain OkHttpClient
- ':app:assembleOssDebug' passes (APK ~80 MB).
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