feat(notifications): inline reply from a browser notification (#203)

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

src/app/utils/dom.ts

@@ -278,7 +278,11 @@ const isDesktopApp = (): boolean =>
 
 export const showOsNotification = async (
   title: string,
-  options: NotificationOptions & { data?: { path?: string } },
+  options: NotificationOptions & {
+    data?: { path?: string; roomId?: string; threadId?: string };
+    /** Chrome/Android SW notifications: buttons, incl. text-input replies. */
+    actions?: { action: string; title: string; type?: 'button' | 'text'; placeholder?: string }[];
+  },
   onClick?: () => void,
 ): Promise<void> => {
   try {