v1.15.2 enhance memory graph visualization with zone clustering and improved UX

Enhanced

• 🎨 Memory Graph Visualization Improvements:
  • Simplified Export: Removed mermaid and json formats, kept HTML-only to reduce AI confusion
  • Complete Node Type Legend:
    • Added all 6 node types with bilingual support (Chinese/English)
    • Color-coded: Conversation (Yellow), Documentation (Purple), Solution (Green), Code/Test (Blue), Error (Red), Config/Commit (Pink)
  • Type-Based Zone Clustering:
    • Visual zone backgrounds with colored circles
    • Zone labels showing type names (dynamically sized)
    • Hexagonal layout with nodes grouped by type
    • Dynamic zone sizing based on node count
  • Advanced Collision Detection:
    • Collision radius includes label space (35px buffer)
    • Prevents node label overlap
    • Stronger collision forces (strength 0.9)
  • Dynamic Zone Spacing:
    • Automatic spacing: maxRadius × 2.8 + 120px
    • Zones adjust positions based on content volume
    • Prevents zone overlap when nodes are numerous
  • Fixed Double-Click Toggle:
    • Added locked flag to distinguish manual lock from drag
    • Yellow border (4px) indicates locked state
    • Properly toggles lock/unlock on double-click
    • Drag-end only clears fx/fy for unlocked nodes
  • Improved Drag Responsiveness:
    • Increased alphaTarget to 0.5 during drag
    • Better follow-through when dragging nodes

Technical Details

• Zone radius formula: baseRadius + √(nodeCount) × 15
• Safe distance: maxRadius × 2.8 + 120px
• Collision radius: node radius + 35px label space
• Click delay: 250ms to prevent single-click interference
• Force parameters: charge -400, type attraction 0.5

User Experience

• Clear visual grouping by node type
• No overlapping labels even with many nodes
• Smooth drag interactions
• Intuitive lock/unlock with visual feedback
• Bilingual zone labels