Offline, the chat shows what it read: messages cache on arrival.

The room cache was written only on our own sends, deletes and
attachments, so a member who only reads had nothing on an offline boot —
"No messages yet" over a room read the day before, and no faces or names
with it. Messages now persist as they arrive (debounced past the backfill
burst), so the last fifty per channel are there without a network. Our
own face never waits its turn for a thumbnail and never gives it up to
the budget, so the header avatar paints offline too.

tools/offline-cache-test.js boots the PWA build, caches a room, reloads
fully offline and checks messages, names and thumbnails are all there.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01JuwQqNWtDJcxPWtEm9134z

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