The Messages UI trusted only the per-device IndexedDB key, so if the server's
key record was gone (deleted, DB-restored, admin-reset) while a stale private
key lingered in the browser, the app looked 'unlocked' but no one could be
messaged and no setup was offered. Add useKeyState (server 'configured' AND
local unlock): show setup when the server has no key (setup overwrites the stale
local key), unlock when it has one this device hasn't opened, ready otherwise.
ChatThread is now self-contained. Also fix the header title on the Messages and
Notifications pages (was falling through to 'Channel manager').
Move messaging out of the notification center into its own left-nav module
(own page, own unread badge), so a reload returns to it and notifications stay
separate. Add a Messenger-style floating dock (bottom-right): pop a conversation
out from the page, keep chatting across navigation, minimise (rollup) or close.
- Messages is now a routed page; NotificationsPanel reverts to inbox-only and the
nav badge no longer mixes in messages.
- Extract shared KeyGate + ChatThread (used by both the page and dock windows);
e2ee exposes a shared unlock subscription so page and dock agree.
- ChatDock (always mounted for human users) owns the app-wide live-message
subscription and per-device key restore. EN/HU/DE strings.
