[Bug]: Upload analysis crashes with unhandled "Failed to fetch" error instead of graceful UI feedback

[abhishekmanegit]

Bug Description

When submitting a retina scan for analysis from the /upload page, the application crashes with an unhandled Failed to fetch error and displays the Next.js error overlay instead of showing a user-friendly error state.

Steps to Reproduce

1. Navigate to /upload
2. Fill patient details
3. Upload an image
4. Click Execute Analysis
5. Observe the frontend crash and console error

Expected Behavior

The application should gracefully handle failed API requests by:

• displaying a proper error message/toast
• preventing the app from crashing
• optionally allowing retry functionality

Actual Behavior

The frontend throws an unhandled TypeError: Failed to fetch, exposing the Next.js development error overlay and interrupting the user experience.

Possible Fix

Add proper try/catch handling around the upload request and display a fallback UI or toast notification when the backend/API request fails.

I'd like to work on this issue under GSSoC'26.

[santoshikumbhar3-art]

Hi @maintainers,

I would like to work on this issue under GSSoC'26.

I plan to:

• Add proper try/catch handling around the upload analysis request.
• Display a user-friendly error message instead of the Next.js error overlay.
• Prevent application crashes when API requests fail.
• Add a retry option if appropriate.

Could you please assign this issue to me?

Thank you.