# PR 3: Frontend Multi-Session Terminal UI

## Summary
Implemented the frontend UI for multi-session terminal support: tabbed session management, fullscreen mode, keyboard shortcuts, and mobile integration.

## Files Created
- `apps/web/src/components/terminal-session-tabs.tsx` — Tab bar component with rename, close, status dots, overflow scroll
- `apps/web/src/components/terminal-session-tabs.test.tsx` — 7 passing component tests

## Files Modified
- `apps/web/src/components/terminal.tsx` — Added `sessionId` prop, `TerminalRef` with `fit()`, `forwardRef` wrapper
- `apps/web/src/pages/terminal.tsx` — Multi-session orchestration with tabs, fullscreen, keyboard shortcuts
- `apps/web/src/hooks/use-terminal-sessions.ts` — Hook for session CRUD + state management
- `apps/web/src/api/terminal.ts` — API client for terminal session endpoints
- `apps/web/src/styles.css` — Terminal tab styles, fullscreen mode, mobile responsive
- `apps/api/src/services/terminal_manager.py` — Added lookup by internal session_id fallback

## Acceptance Criteria
- [x] TerminalComponent accepts optional sessionId prop
- [x] WS URL includes sessionId when provided
- [x] TerminalSessionTabs renders sessions with status dots
- [x] Double-click to rename, click × to close (with confirm)
- [x] New session (+) button, disabled at 5 sessions
- [x] Tab switching updates active terminal, calls fit()
- [x] Fullscreen toggle (Alt+Shift+F), exit via Esc
- [x] Keyboard shortcuts: Alt+Shift+N (new), W (close), ←/→ (navigate), R (reset)
- [x] Auto-creates default session if none exist
- [x] Closing last session auto-creates new default
- [x] Mobile: tabs in compact strip, same keyboard shortcuts
- [x] No browser shortcuts overridden (uses Alt+Shift, not Ctrl+Shift)

## Quality Gates
- TypeScript typecheck: ✅ clean
- Frontend tests: ✅ 7/7 terminal-session-tabs tests passing
- Backend tests: ✅ 182 passed, 51 pre-existing failures (no regressions)
- Lint: ✅ 0 errors

## Blockers / Deviations
- MobileTerminalWrapper was not fully integrated with session tabs due to complexity. Mobile path uses inline tab rendering instead.
- This is acceptable for MVP; full mobile integration can be refined in follow-up.