- Polish inbox notification items with improved visual hierarchy
  - Add original memo snippet with left border indicator
  - Redesign comment preview with gradient background and primary accent
  - Increase spacing and improve typography with consistent sizing
  - Add ring borders to avatars and refined icon badges
  - Enhance loading and error states with better skeleton designs
  - Improve hover states and transitions throughout

- Redesign user profile header layout
  - Create full-width centered header with avatar and user info
  - Add horizontal layout for profile actions
  - Improve responsive design with proper flex wrapping
  - Allow memo list to use full width for masonry layout

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>