Integrate complete PowerSync library synchronization

[Eoic]

Summary

Update the client and server submodules to complete persistent, offline-capable PowerSync synchronization for books, shelves, topics, notes, annotations, bookmarks, and memberships. Includes complete annotation editing, persistent favorites, and physical-book bookmark synchronization.

Companion PRs and rollout

1. Server: Complete PowerSync library persistence and synchronization server#5 — owned persistence, atomic uploads, migrations, tombstones, and expanded sync streams.
2. Client: Complete offline library sync and fix annotation editing and favorites client#23 — persistent repositories, reactive library views, offline/profile isolation, and editing fixes.
3. Merge this workspace update after the companion changes. Deploy the server schema/upload support and activate the expanded PowerSync configuration before updating clients.

No key regeneration or database reset is required. Both feature branches include current target-branch changes; the reader submodule stays at the target branch's revision.

Validation

• Backend: 295 tests passed, 2 skipped; Ruff, changed-scope mypy, and migration checks passed.
• Client: analysis and 1,080 tests passed, 10 skipped; full suite rerun after the target-branch merge. Release web build passed during implementation.
• Live two-client synchronization plus separate-account isolation passed, including offline restart, null clearing, bookmarks, favorites, and deletion against stale edits.
• Local schema/publication updates applied and active replication checkpoints verified after restart.

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

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