- Add SortOption enum for note sorting (Updated, Created, Title, Type)
- Add SortDirection enum with ASCENDING/DESCENDING and toggle()
- Add ChecklistSortOption enum for in-editor sorting (Manual, Alphabetical, Unchecked/Checked First)
- Implement persistent note sort preferences in SharedPreferences
- Add SortDialog for main screen with sort option and direction selection
- Add ChecklistSortDialog for editor screen with current sort option state
- Implement sort logic in MainViewModel with combined sortedNotes StateFlow
- Implement sort logic in NoteEditorViewModel with auto-sort for MANUAL and UNCHECKED_FIRST
- Add separator display logic for MANUAL and UNCHECKED_FIRST sort options
- Add 16 sorting-related strings (English and German)
- Update Constants.kt with sort preference keys
- Update MainScreen.kt, NoteEditorScreen.kt with sort UI integration
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