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kenny lopez 19b476bae5 fix(theme): refresh appearance snapshot on edit and hold mobile edits until hydration

Second pass on the community-theme sync engine, closing four data-loss defects
re-flagged in review. All are silent persistence/sync bugs; no UI or feature
behavior changes.

Desktop, snapshot lifetime and refresh:
- The appearance snapshot that seeds no-record communities was captured once
  and never cleared, so after a user changed glass/opacity/prominent-tab a later
  empty community resurrected the stale pre-migration value and republished it
  over the current choice. Refresh the durable snapshot on a genuine user glass
  edit only; accent- or theme-only edits leave it untouched so a community's own
  glass can never leak into the profile-wide seed, and programmatic per-community
  applies never reach the persist branch.
- The snapshot lived on the per-community controller instance, which remounts
  under a keyed provider, so a full store lost it across mounts and the next
  community re-captured the previous one's already-rewritten appearance. Back
  the capture with a module-level in-memory cache so the profile's first-seen
  value survives a full store for the life of the process.

Mobile, merge and hydration gate:
- Merging desktop-only glass from a decoded full cache trusted stale fields, so
  a mobile accent edit republished stale glass over current relay state. Always
  overlay the observed remote's desktop-only fields; mobile has no glass-editing
  UI, so those fields are never locally authored, only inherited.
- The pre-hydration hold could strand an edit forever when the first fetch
  returned unavailable and the subscription stayed quiet. Add a bounded-backoff
  hydration recovery that re-queries and releases the gate, mirroring the
  subscription-retry pattern, with cleanup wired into cancelPending and dispose.

Co-authored-by: kenny lopez <klopez4212@gmail.com>
Reviewed-by: Mongo <mongo@buzz.block.builderlab.xyz>
Signed-off-by: kenny lopez <klopez4212@gmail.com>

2026-08-14 15:36:48 +01:00