Implement Authentication Error Cleanup UI

[MRIARC-08]

Auth service has been cleaned up and improved:

Backend Status: ✅ Complete

• Better error handling in auth service
• Clear error messages for failed operations
• Proper refresh token management
• Session validation improvements

Frontend Work Required:

• Display auth errors clearly to users
• Show specific error messages (invalid email, wrong password, etc.)
• Improve login form error states
• Add password visibility toggle
• Remember email option
• Better refresh token error handling

Components to Update:

• src/app/(auth)/login/page.tsx - Display error messages
• src/app/(auth)/register/page.tsx - Field validation feedback
• Add field-level error components

Integration Points:

• Parse error messages from auth endpoints
• Show appropriate user-friendly messages
• Retry on session expiry
• Clear form on successful auth

Expected Outcome: Better UX for authentication with clear error handling.

Related to backend: Auth Error Cleanup (PR #30)

This is a GSSoC'26 contribution opportunity!

[Achiever199]

hi @MRIARC-08 , please assign this issue to me

[pisum-sativum]

@MRIARC-08 Kindly assign me this issue

[itz1cr]

@MRIARC-08 assign please

[NaisargPurohit]

Hi Maintainer I am a student at BMSCE participating in the COMMIT-ed Open Source Sprint. I would love to work on this issue and contribute to the project! I have experience with this tech stack and have already set up the project locally.
Could you please assign this to me? Thanks!