- The page asks the service worker for its version before using it, and
has the browser fetch a newer one when it is out of date; the app also
checks for a new sw.js on every start. An older worker left over from a
previous release silently ignored the page's requests, so saving only
resumed after offline access was switched off and on.
- Fewer console errors offline: the server probe goes through the worker;
fonts, the illustration, lazy chunks and the PDF worker (named inside
the app's scripts and styles) are saved with the app; sender pictures
are pre-loaded, and an unsaved one is "no picture" (204), not a 503;
plugin bundles and plugin lookups are saved (per-message ones go with
their message); POST lookups and live-update reconnects wait for the
server to be back instead of failing over and over.
- The setting moves from Settings → Security to Settings → Accounts.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Pre-loading relied on the page being controlled by the service worker, so
its requests would pass through it and be saved. A page loaded with a hard
reload (Ctrl+Shift+R) never is: pre-loading then waited, gave up silently,
and nothing new was saved — the app still could not start offline, and
Settings kept showing the old sync time.
The page now asks the worker by message to fetch and save each URL, which
works however the page was loaded. Sign-out reaches the worker through its
registration for the same reason. Thread URLs come from shared helpers in
api.ts, so pre-loading saves exactly what the app asks for.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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>
lukasandClaude Opus 5.5