- Add user override interface for custom time estimation (H/M inputs with add/replace toggle)
- Implement override-only calculation when no notes are available
- Fix cycle tracking to update/reset on each calculation
- Enhance cycle progress display format: "Cycles X/X - Sessions X/X - XH/XM"
- Separate Pomodoro visibility from review buttons for persistent display
- Add comprehensive estimation logic supporting both note-based and override-only scenarios
- Improve UI styling with focus states, better visual hierarchy, and responsive layout
