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dc1cdcd3aa
feat(KB-270): add drag-and-drop reordering for subtasks
- Add drag-and-drop state management with mouse event handlers
- Add CSS styles for subtask drag states (dragging, drop-target, drop-before/after)
- Integrate drag-and-drop into SubtaskBreakdownModal with grip handles
- Add keyboard accessible reordering with up/down arrow buttons
- Add comprehensive tests for drag-and-drop interactions
- Update AGENTS.md with subtask dialog documentation
- Add changeset for subtask drag-reorder feature