Create and edit JSON Canvas files with nodes, edges, groups, and visual connections.

• Supports four node types: text (with Markdown), file references, external links, and visual groups for organizing layouts
• Edges connect nodes with optional labels, directional arrows, anchor points (top/right/bottom/left), and color coding
• Includes comprehensive validation workflows: ID uniqueness checks, edge reference integrity, and JSON parsing to prevent broken canvases
• Provides layout guidelines with suggested dimensions for different node types and spacing rules to avoid overlaps