- Create QuickScriptsDropdown component with script listing, one-click execution, and keyboard navigation (arrow keys, Enter, Escape)
- Replace static Scripts button in Header with dropdown menu showing all configured scripts
- Add loading, empty, and error states with 'Manage Scripts...' footer link
- Add full CSS styles with theme support, animations, and mobile responsiveness
- Add comprehensive tests (510 lines) covering rendering, interactions, keyboard nav, and edge cases
