[Web/PWA] Complete library management beyond EPUB upload

[AlphaMao1]

Parent

#11

What to build

Extend the library from simple upload/restore into the core book-management surface from the existing DeepReader release: search, tags, book cards, book metadata, status, and user-visible operations. This should remain EPUB-only for the first version.

Acceptance criteria

• Users can search books by title, author, and tag from the library.
• Users can view, create, rename, and filter by tags or equivalent first-version categories.
• Book cards show stable metadata, cover/thumbnail fallback, reading progress, upload/sync state, and indexing state.
• Users can edit basic book metadata without corrupting the stable book identity/hash.
• Users can start deletion from the library, with clear copy about storage, index, annotations, and memory behavior.
• Empty, loading, uploading, upload-failed, indexing, indexed, sync-failed, and offline states are visible and not represented by fake static progress.
• The same library state restores in a second signed-in browser/device session.
• Desktop and Android/narrow layouts are usable under the approved visual system.

Blocked by

• [Web/PWA] Upload EPUB and restore library across devices #14
• [Web/PWA][UI] Apply selected visual system to app shell and core screens #23