F1: warmPageYdoc now returns didSync (true only on the real 'synced' event,
false on the 8s timeout / error, which are now logged). The tree menu gates
the 'available offline' success toast on result.ok AND didSync, and pushes
'editor' into the failed set otherwise — so a page whose Yjs body never
warmed is no longer reported as fully offline-available.
F2: tests for the page/space/currentUser failure labels and the didSync
true/false paths.
F3: correct the mobile-app-plan / mobile-bootstrap present-state sections to
match shipped code (Capacitor, CORS allowlist, Swagger, offline reading,
/l in the SW denylist).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>