Implements docs/offline-sync-plan.md milestones M0–M2.
M0 (PWA shell):
- Add vite-plugin-pwa (generateSW, registerType: 'prompt', manifest:false);
NetworkOnly for /api,/collab,/socket.io, NetworkFirst for GET /api,
navigateFallback to index.html.
- Register SW via useRegisterSW with a Mantine update prompt; skip
registration inside Capacitor native WebView (is-capacitor guard).
M1 (harden CRDT body + title into Yjs):
- Lift the per-page Y.Doc/Hocuspocus providers into a shared hook+context so
body and title editors share one doc.
- Move the page title into a dedicated 'title' Yjs fragment (CRDT, offline-
tolerant); drop the REST title save. Server persists the title fragment to
page.title and seeds it for legacy pages (empty-fragment guard); a collab
rename emits a treeUpdate so other users' tree/breadcrumbs refresh.
- Persist the rebuilt ydoc on the content->ydoc path to neutralize the Yjs
duplication trap. Add a 3-state sync indicator.
M2 (offline read/navigation):
- Persist React Query to IndexedDB (idb-keyval persister, version buster,
selected roots only).
- "Make available offline" action warms page, space, tree (root+ancestors+
children) and comments under exact hook keys, plus the page ydoc.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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