feat(ui): profile page premium polish + keyboard shortcuts panel
Profile page:
- Hero: gradient upgrade, animated shimmer sweep, pulsing glow orb, bottom fade
- Header card: avatar ring glow, stats with icons (data-driven), tabular-nums
- Tabs: stagger animation on grid items, tab trigger transitions
- Skeleton: consistent with loaded state styling
- Page entry animation (fade-in)
Keyboard shortcuts panel (Discord-style):
- New KeyboardShortcutsPanel component with framer-motion animations
- Groups: General, Playback, Navigation
- Styled kbd badges with semantic tokens
- ARIA: role=dialog, aria-modal, aria-label
- Replaces old KeyboardShortcutsHelp component
- Fix: ? key handler no longer blocked by !e.shiftKey guard
Co-authored-by: Cursor <cursoragent@cursor.com>
d829e228a8