Add Grad-CAM visualization styles and flip functionality

[alok-devforge]

This pull request introduces enhancements to the Grad-CAM visualization feature in gradcam.html and updates the .vscode/settings.json file to configure the Live Server port. The changes focus on improving the 3D flip animation, ensuring smooth transitions, and addressing rendering issues for Grad-CAM images.

Grad-CAM Visualization Enhancements:

• New CSS Classes for 3D Flip Animation: Added .visual-container, .visual-xray, and .visual-gradcam classes to support 3D flip animations with smooth transitions and proper backface visibility handling. (gradcam.html, gradcam.htmlR131-R179)
• Improved Flip Logic: Refactored the flip button's event listener to toggle the flipped class on the container and ensure animations play correctly by forcing reflows. (gradcam.html, gradcam.htmlL401-R458)
• Grad-CAM Image Rendering Fix: Added logic to repaint the Grad-CAM image by temporarily clearing and resetting its src attribute to address visibility issues during the flip. (gradcam.html, gradcam.htmlR469-L434)

Development Environment Configuration:

• Live Server Port Configuration: Updated .vscode/settings.json to set the Live Server port to 5502 for consistent local development. (.vscode/settings.json, .vscode/settings.jsonR1-R3)