[GOOD FIRST ISSUE] Improve error messages for invalid file types

[kiku-jw]

Description

Currently, when users try to upload unsupported file types, the error message could be more helpful.

Task

Improve error handling in docs/assets/app.js to show clearer messages when:

• File type is not supported
• File is corrupted
• File is too large

Files to Modify

• docs/assets/app.js - Add better error messages
• docs/index.html - Update UI to display errors clearly

Acceptance Criteria

• Clear error message for unsupported file types
• Error message shows which file types are supported
• Error message is user-friendly (not technical jargon)
• Errors are visually distinct (e.g., red background)

Tips

• Look at the processFiles method in app.js
• Check existing error handling patterns
• Test with various file types (.pdf, .xlsx, .jpg, etc.)

[roshninaktode]

Hi @kiku-jw I would like to work on this issue. Could you please assign this issue to me ?

[kiku-jw]

@roshninaktode Yes

[roshninaktode]

Please feel free to unassign me from this issue. 🙂
Thank you!