For encrypted rooms, bookmarks persist only {roomId, eventId, savedAt}
and reminders only their non-text fields; the preview, room name and
sender resolve locally at render/fire time from the timeline (with a
"Message unavailable" fallback). A one-time, loop-guarded cleanup strips
text from existing entries in currently-encrypted rooms. Unencrypted
rooms are unchanged. Unit-tested.
Fixes#10
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
