Composer drafts persist per room, but nothing in the room list showed
which OTHER rooms had an unsent draft. Add a subtle chat-bubble icon on a
room's nav item when it has a message draft (and isn't the open room), so
half-written messages elsewhere are visible at a glance.
- Shared pure helper hasMsgDraft (utils/draft.ts, unit-tested) replaces
the inline emptiness check; the composer DraftIndicator now reuses it.
- RoomNavItem reads a memoized selectAtom(draftAtom, hasMsgDraft) so a row
re-renders only when its draft flag flips (the draft atom is written on
room-leave, not per keystroke). Uses Icons.Message (pencil is reserved
for the custom-name marker), muted, aria-label "Unsent draft".
- useHydrateMsgDrafts (mounted in ClientNonUIFeatures) pre-fills the
per-room draft atoms from draft-msg-* localStorage on startup, so
indicators are correct after a page reload, not only after revisiting a
room. Thread drafts (key contains ::) are skipped; room-level only.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
