DetailPanel.tsx:
- Replaced window.prompt with native inline editing
- Click title text or 'Rename' button to enter edit mode
- Input field with lyria-accent border, focus ring, and placeholder
- Auto-focus + select-all on enter edit mode (useEffect)
- Enter to save, Escape to cancel, blur to save
- Title text has hover:bg-white/5 for visual feedback
- Non-editing title is clickable (cursor-pointer, title tooltip)
- Uses useState for edit mode and draft text, useRef for input focus