Add sortOrder column to diagrams, extend PATCH endpoint with projectId
and sortOrder fields, add POST /diagrams/reorder bulk endpoint with
ownership verification and duplicate ID validation. Enhance RecentList
with lastAiMessage preview subtitle. Implement @dnd-kit drag-and-drop
in ProjectTree sidebar with cross-project moves, intra-project reorder,
optimistic updates, drag overlay, drop indicators, and keyboard/pointer
sensor support. Context-aware GET ordering: sortOrder for project views,
updatedAt for recent/all views. 141 tests pass.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add PATCH and DELETE endpoints with ownership checks (403 vs 404),
inline rename on DiagramCard and editor header, delete confirmation
dialog, and differentiated error states for forbidden/not-found.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
