Improve frontend UX and error feedback for retina analysis flow

[aditya-30-05]

Overview

This PR improves the frontend user experience and error handling across the retina upload, analysis, and history workflows.

Changes Made

Upload Page

• Added client-side file validation
• Added file size validation
• Added inline validation feedback
• Added retry support after failed uploads
• Improved loading state messaging
• Fixed object URL cleanup to prevent memory leaks
• Improved accessibility using ARIA attributes
• Enhanced responsive spacing for smaller screens

Result Page

• Added success feedback banner
• Added safe session data parsing
• Improved share action feedback
• Added user-friendly PDF export fallback handling

History Page

• Added dedicated connection error state
• Added Retry Connection functionality
• Separated empty-state UI from network failure UI

Validation

• Next.js production build successful
• TypeScript compilation successful
• Manual testing completed

Closes #1

[vercel]

@aditya-30-05 is attempting to deploy a commit to the Pushkarini 's projects Team on Vercel.

A member of the Team first needs to authorize it.

[aditya-30-05]

Hi @Pushkarini579,

I've completed the implementation for this issue and submitted a PR for review.

Implemented

• Client-side file validation
• Improved error feedback
• Retry functionality
• Enhanced loading and success states
• Accessibility improvements
• Object URL cleanup to prevent memory leaks
• History page connection error handling with retry support

The Vercel preview deployment appears to require authorization from the project team. Please let me know if any additional changes, testing, or refinements are needed from my side.

Looking forward to your feedback.

Thank you!

[aditya-30-05]

Hi @Pushkarini579,

It looks like the Vercel preview deployment is awaiting authorization from the project team.

The changes build successfully on my local environment (npm run build completed without errors), and there are no merge conflicts with the base branch.

Please let me know if any additional changes or fixes are required from my side.

Thank you!