# Visual Diff Viewer Implementation Plan

## Core Requirements
1. Side-by-side comparison interface
2. Syntax highlighting for code diffs
3. Inline comment anchoring
4. Change navigation controls
5. Performance budget: 200ms render time

## Technical Integration
- **Frontend**  
  Extend `DiffViewer` component (line 62) with:
  ```typescript
  interface EnhancedDiffViewer {
    renderStrategy: 'inline' | 'side-by-side';
    syntaxHighlighters: Map<string, Highlighter>;
    commentThreads: CommentThread[];
  }
  ```
  
- **Backend**  
  Enhance `ChangeTracker.compute_diff()` (line 156):
  ```python
  def compute_enhanced_diff(self, version1, version2):
      """Return structured diff with syntax metadata"""
  ```

## Dependency Matrix
| Component | Affected Lines | Modification Type |
|-----------|----------------|--------------------|
| HistoricalChangeMixin | Current impl. line 6 | Extension |
| CollaborationSystem | line 90 | Event handling |
| VersionControlUI | line 62 | Props update |

## Phase Plan
1. **Week 1**: Diff algorithm optimization
2. **Week 2**: UI component development
3. **Week 3**: Performance testing
4. **Week 4**: Security review