- Add backend terminal API with session management and SSE streaming
- Create useTerminal hook for command execution and history navigation
- Implement interactive TerminalModal with real-time output display
- Add terminal button to Header for quick access
- Style terminal with CSS variables and responsive design
- Add keyboard shortcuts (Ctrl+C to kill, Ctrl+L to clear, arrow keys for history)
- Add security validation for shell commands
- Add backend terminal API with SSE streaming for real-time output
- Create useTerminal hook with command history and navigation
- Refactor TerminalModal into interactive shell component
- Update App and Header for standalone terminal button
- Add CSS styles for terminal UI (prompts, output, spinner, welcome screen)
- Update tests for new terminal behavior
- Add section expansion state management with localStorage persistence
- Update section headers with chevron toggle controls
- Implement conditional task row rendering based on section state
- Add Expand All / Collapse All toolbar controls
- Add CSS styles for chevron rotation animation and section headers
- Add comprehensive tests for collapsible section behavior
