gm 97e2406044 ui: 2D canvas tree builder (Step 2) ...

- Replace list-based editor with 2D canvas tree visualization
- Nodes laid out by depth column + subtree-height algorithm
- Bezier curves connect parent→child (accent-colored when selected)
- Click node to select; detail panel on right shows editable fields
- Canvas toolbar holds doc title/mark + add/import/new actions
- Inline renderNode() removed; renderValue() for node-type shows reference widget with → navigate button
- addTopNode()/addChildNode() auto-select the new node
- Preview panel stays in right-panel stacked under detail

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-06-05 12:31:36 +09:00

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