Add four improvements to the interactive TUI:
- Stats panel auto-sizes to content width (width:auto), giving the chart more horizontal space
- Bar count computed from terminal width on startup and resize; +/- for manual override; 'a' to reset to auto
- 'n' key opens a modal to add a new rain record, with optional backfill of zero-rain days
- 's' key (daily view only) enters select mode for bar navigation; 'e' key opens edit modal, pre-populated from selection
Closes #5
Add four improvements to the interactive TUI:
- Stats panel auto-sizes to content width (width:auto), giving the chart more horizontal space
- Bar count computed from terminal width on startup and resize; +/- for manual override; 'a' to reset to auto
- 'n' key opens a modal to add a new rain record, with optional backfill of zero-rain days
- 's' key (daily view only) enters select mode for bar navigation; 'e' key opens edit modal, pre-populated from selection
Closes #5