- Separator component: Visual divider between unchecked and checked items
* Shows count of completed items with denominator styling
* Prevents accidental drag across group boundaries
* Smooth transitions with fade/slide animations
- Sorting logic: Maintains unchecked items first, checked items last
* Stable sort: Relative order within groups is preserved
* Auto-updates on item toggle and reordering
* Validates drag moves to same-group only
- UI improvements: Enhanced LazyColumn animations
* AnimatedVisibility for smooth item transitions
* Added animateItem() for LazyColumn layout changes
* Item elevation during drag state
- Comprehensive test coverage
* 9 unit tests for sorting logic validation
* Edge cases: empty lists, single items, mixed groups
* Verifies order reassignment and group separation
Affected components:
- CheckedItemsSeparator: New UI component for visual separation
- NoteEditorViewModel: sortChecklistItems() method with validation
- NoteEditorScreen: Separator integration & animation setup
- ChecklistSortingTest: Complete test suite with 9 test cases
- Localizations: German & English plurals
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