Implemented user profile display in the chat interface:
- Created UserMenu component with avatar, handle display, and dropdown
- Added /api/user/profile endpoint to fetch user data from Bluesky
- Added /api/auth/logout endpoint to clear auth cookie
- Integrated UserMenu into chat page header
- Shows user's ATproto avatar with initials fallback
- Dropdown menu displays user info and logout option
- Fixed JWT import to use verifySurrealJwt
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Co-Authored-By: Claude <noreply@anthropic.com>