- Add `order: number | null` to VaultEntry (TS) and VaultEntry (Rust)
- Add order to Frontmatter struct and SKIP_KEYS in vault.rs
- Update all mock Type documents with order values (0-10)
- Add order: null to all non-Type mock entries and test fixtures
- Install @dnd-kit/core, @dnd-kit/sortable, @dnd-kit/utilities
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>