Added:
- Community Share: export/import exercises, programs, intervals
- GROUP type in ToDo for group-based tasks
- Group reordering (drag-and-drop)
- Group-level select all in ToDo
- ToDo swipe-to-delete confirmation
- Per-exercise round info in interval records
- 50MB import size limit

Improved:
- Settings reorganized into sections
- SAF file picker for pre-import backup

Fixed:
- Theme switch losing screen state
- Interval flash/beep when interval is 0s

Contributors: SomeTr, nautilusx