Backend:
- Fix MoveNode validation: wouldCreateCycle walks from newParentID up
toward root, rejects if nodeID is encountered (parent into descendant)
- Allow moving descendant to ancestor (C into A) and child to root
- Add isContainerType validation for new parent
- Add 8 tests covering all scenarios + duplicate ID invariant
Frontend TreeNode.svelte:
- Build parent map from full tree (not just loaded children)
- canDrop uses parent map for cycle detection
- Reactive drop-valid/drop-invalid CSS via pre-computed dropAllowed map
- Keyed {#each nodes as node (node.id)} for correct identity tracking
- Auto-expand container on 600ms drag-over hover
- Proper dragleave detection (ignore transitions to child elements)
- Clean up state on dragend
Frontend App.svelte:
- reloadTreePreservingExpanded: fresh roots + children (no patching)
- Root area visual drop indicator (dashed outline)
- dragleave handler for root area
Clean up stale GUI dist assets
mirivlad