- Implemented multi-tab support in TerminalModal component
- Each tab maintains independent WebSocket connection and xterm instance
- Tab management: create, switch, close tabs with keyboard shortcuts (Ctrl+Tab)
- Added Plus button to create new tabs
- Added close button on tabs (except last remaining tab)
- Updated keyboard shortcuts text in status bar
- Connection status indicator per tab
- Per-tab scrollback buffers preserved when switching tabs
- Auto-cleanup of all sessions when modal closes
- Added comprehensive tests for multi-tab functionality
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