lukasandClaude Opus 5.5
a2c52f33a8
An opt-in per device (Settings → Security → Offline access) installs a service worker that keeps the newest 50 Inbox conversations, and the ones opened recently, for reading when the server cannot be reached. While online everything still comes from the server; the saved copy is only the fallback, marked X-WM-Offline so the app knows it is offline. Offline, an amber cloud next to the theme toggle says so and when mail was last saved; actions that need the server are greyed out and say "Not available offline"; conversations and folders not saved here are faded or say so. A probe notices the server coming back, shows "Back online" and refreshes everything. Saved mail is wiped on sign-out, on any 401, and when another user signs in. nginx never caches /sw.js, so releases reach it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>