feat: implement mobile terminal UX
- Add mobile viewport detection hook
- Add virtual keyboard detection with fallback
- Add auto-hide hook for header/keys strip
- Add special keys mapping hook
- Create MobileTerminalHeader, SpecialKeysStrip, SpecialKeysPanel components
- Create MobileTerminalWrapper component
- Update TerminalComponent with mobile support, font scaling, copy/paste, reconnection
- Update AppShell to hide chrome on mobile terminal pages
- Update TerminalPage to use MobileTerminalWrapper
- Add comprehensive mobile terminal styles
- TypeScript check passes
- Build succeeds
Fusion
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