feat(dashboard): add Grad-CAM heatmap overlay visualizer

[Deepak06-v]

Description

This PR resolves the issue by integrating the Grad-CAM activation map overlay visualization on the scan analysis page (AnalysisDashboard.tsx).

Key changes:

• Retrieves photo_url from the scan result and fetches the image in the frontend, sending it to the backend /api/v1/gradcam endpoint to generate the Grad-CAM base64 JPEG heatmap.
• Dynamically splits the desktop layout when a photo is available to display a Scan Visualization card on the left and the Score Card / Species Panel stacked on the right. If no photo is available, falls back to the original side-by-side layout.
• Renders the scanned fish with viewfinder corners and stacks the Grad-CAM heatmap overlay on top of it.
• Added interactive controls to the visualization card:
  • Toggles: Quick-buttons to switch between ORIGINAL (0% opacity), BLENDED (50% opacity), and HEATMAP (100% opacity).
  • Blend Slider: A range slider to adjust opacity smoothly from 0% to 100%.
  • Color Legend: Shows a LOW → HIGH color gradient bar when the heatmap is visible.
  • State Overlays: Styled overlays for loading (spinner) and error (retry button) states.

Checklist

• npm run lint passes with no errors
• npm run build compiles without TypeScript errors
• python -m pytest passes (including new tests I added)
• No .env files, API keys, secrets, model weights, or __pycache__ in this diff
• Branch is rebased on main, not merged

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• src/pages/AnalysisDashboard.tsx

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