backend:
- add required user name and optional bio fields
- extend auth/register and user schemas/services with name/bio
- add alembic migration 0006 with safe backfill name=username
- compute per-user chat display_title for private chats
- keep Saved Messages delete-for-all protections
web:
- registration now includes name
- add profile edit modal (name/username/bio/avatar url)
- show private chat names via display_title
- fix context menus to open near cursor with viewport clamping
- stabilize +/close floating button to remove visual jump
- add Saved Messages system chat with dedicated API
- add public group/channel metadata and discover/join endpoints
- add chat delete flow with for_all option and channel-wide delete
- switch message actions to context menu and improve reply/forward visuals
- improve microphone permission handling for voice recording
- add reply_to/forwarded_from message fields and chat pinned_message field
- add forward and pin APIs plus reply support in message create
- wire web actions: Reply, Fwd, Pin and reply composer state
- fix spam policy bug: allow repeated identical messages, keep rate limiting
- implement chat query filtering and message search endpoints
- add db indexes for search fields
- activate chats search input in web
- replace inline create panel with floating TG-style action menu
- add owner/admin/member permission checks
- implement member add/remove, role updates, and leave flow
- add chat title update endpoint for manageable chat types
- add media preview and upload confirmation for image/video
- add upload progress tracking for presigned uploads
- keep voice recording/upload flow with better UI states
- include related realtime/chat updates currently in working tree
