- Replace generic card/gray styling with the group's own tint, derived
via color-mix so the dialog reads as a "window" version of the card
- Add 3px colored border, tinted header/footer panels, and softened
border rules on todo rows to tie the whole dialog to one hue
- Give the Save button a solid accent background with theme-appropriate
text color (white on light, dark on neon) for clear affordance
- Replace the separate "Details" label and edit/preview button row with
a compact icon button beside the title input
- Remove the "No details yet" placeholder to keep the row compact when
details are not being edited
- Pin the title input to a fixed width so it no longer stretches to fill
the row
- Combine group notes and to-dos in one editing surface
- Add debounced autosave with explicit save and flush-on-close
- Preserve in-progress local edits against cross-device and AI updates