- show one action button in composer: mic when empty, send when text exists
- add floating scroll-to-bottom button in message list
- exclude non-text/media messages from Chat Info links list to avoid duplicates
- replace modal message search with header inline search controls
- add global top audio bar linked to active inline audio player
- improve chat info header variants and light theme readability
- add chat_updated realtime event and dynamic chat subscriptions
- auto-join invite links in web app
- implement Telegram-like settings panel (general/notifications/privacy)
- add browser notification preferences and keyboard send mode
- improve chat list with last message preview/time and online badge
- rework chat members UI with context actions and role crowns
- add chat_notification_settings table and migration
- add chat notifications API (get/update muted)
- skip message notifications for muted recipients
- add mute/unmute control in chat info panel
- block send/forward in channels for member role on backend
- expose my_role in chat payload for client-side permissions
- hide message composer for channel members and show read-only notice
- hide members management sections for private/saved chats in info panel
- return enriched chat detail via serialize_chat_for_user
- add user last_seen_at with alembic migration and persist on realtime disconnect
- extend chat serialization with private online/last_seen, group members/online, channel subscribers
- add Redis batch presence lookup helper
- update web chat list/header to display status counters and last-seen labels
- improve delivery receipt handling using last_delivered/last_read boundaries
- include chat info panel and related API/type updates
