Message notifications shown through the service worker now carry a text-input
'Reply' action (Chrome desktop/Android). On notificationclick with
action==='reply' the SW sends the typed text itself — it already holds the
newest session's access token for authenticated media — as m.room.message
(threaded when the notification was for a thread), so it works with the tab in
the background or closed; a failed send shows a 'Reply not sent' notification
that opens the room. Not offered for encrypted rooms (the SW cannot encrypt).
The sender lives in swReply.ts so it is unit-tested; verified headless that
the SW notification carries actions + {roomId, threadId}.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
