feat: redesign authenticated UI with home overview and settings hub
- Add HomePage with open sessions grid, projects overview, and session composer
- Add SettingsPage with tabs for General, SSH Keys, Tool Types, Tool Configs
- Update navigation to Home, Projects, Settings
- Redirect legacy routes (/sessions, /ssh-keys, /tool-types, /tool-configs)
- Apply Inter font and warm editorial styling
- Update tests for new dashboard and projects pages
Quality gates: typecheck pass, lint pass, 15/15 tests pass
Refs: openspec/changes/ui-redesign-home-settings
miguel
6f35eb77ae