# Hi2Chat Build 04.3 - Professional Browser Lobby UI

## Added / improved
- Professional lobby feed UI based on the approved browser mockup direction.
- Light Blue / White stays default, themes remain inside Settings -> Appearance.
- Compact left-side public feed: avatar, username, flag, message, reactions, time.
- @mention highlight and mention panel.
- Click username/avatar profile preview popup.
- User customization foundation: theme, username color, message text color, font size.
- Video popup stays separate and does not disturb the lobby.
- Mobile responsive polish with sidebar drawer behavior.
- Debug log stays hidden unless opened from the top action.

## Test
1. npm install
2. npm run start:dev
3. Open tools/socket-test-client.html
4. Connect two browser tabs as UserA and UserB
5. Send messages and use @UserB or @Lucas mentions