fix: resolved Google login issue and improved backend token verification

[BoomikaSN]

• Fixed the Google authentication flow in both client and server

- Verified Google ID token using `google-auth-library` in backend - Connected MongoDB and ensured user creation/login works as expected - Cleaned up `.env` configs for SMTP and JWT

Users were unable to log in via Google due to token verification failure. This fix ensures proper OAuth flow, secure backend validation, and smooth login experience.

This PR fixes the Google authentication flow and improves backend integration:

1. Google OAuth Fix

   • Registered localhost as authorized origin
   • Verified Google ID token using google-auth-library
   • Ensured Client ID matches across frontend and backend

2. MongoDB Integration

   • Connected MongoDB and ensured user creation/login works

3. Environment Configuration

   • Cleaned up .env files for SMTP and JWT secrets

4. Frontend Scripts

   • Added React start/build/test scripts to client/package.json

[netlify]

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