- Add sort mode selector (Updated/Created/Custom) with localStorage persistence
- Sort notes client-side via derived stores based on selected mode
- Enable drag-to-reorder in Custom mode via svelte-dnd-action on NoteGrid
- Add POST /api/notes/reorder endpoint for bulk sortOrder updates
- E2E tests for sorting by updated/created and persistence across reload
Closes#12
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
