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Add confusion matrix visualization component

Build interactive confusion matrix heatmap for ML model evaluation.

Features

  • D3.js heatmap visualization
  • Hover tooltips with metrics
  • Click to drill down into predictions
  • Export to PNG/SVG
  • Responsive design

Metrics to display

  • True Positives/Negatives
  • False Positives/Negatives
  • Precision, Recall, F1 Score