Review round 6:
- Loading the page that replaces the deleted one keeps the map and theme
  on screen while a change to them is still on its way, as using the
  cloud version after a conflict already did (shared helper now).
- OK reads the server again first, so a read that failed earlier does
  not fail every retry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>