feat: add user profile drawer with wallet info, join date, groups cou…

[cybermax4200]

Closes #182
Creates a profile drawer that displays anonymous user information without exposing personal identity. Uses vaul (already installed, previously unused) for responsive bottom-sheet/dialog behavior.
Changes
New: components/profile-drawer.tsx

• Avatar circle with wallet initial
• Shortened wallet address via existing shortenWalletAddress utility
• "Copy full address" button with clipboard API + checkmark feedback
• Join date — fetched from supabase.auth.getUser().user.created_at
• Groups joined count — fetched from GET /api/rooms
• Disconnect Wallet button — calls the full cleanup flow (wallet kit disconnect + /api/auth/logout + Supabase signout)
  Modified: components/wallet-connector.tsx
• Wallet address pill now opens the profile drawer instead of showing inline address + disconnect button
• Disconnect moved into the drawer
  Acceptance Criteria
• Drawer opens from navbar wallet pill click
• Responsive — bottom sheet on mobile, centered dialog on desktop (vaul handles this automatically)
• Wallet address shortened automatically (4+4 chars via shortenWalletAddress)
• Shows Stellar wallet address
• Shows account join date from Supabase
• Shows groups joined count
• Disconnect wallet with full cleanup

[drips-wave]

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