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Fix allows users to sign in through Google with one click.
Backend Changes:
Installed Dependencies: Added google-auth-library, passport-google-oauth20, and passport packages
Updated User Model: Added googleId field to support Google OAuth users
Created Google OAuth Controller: Added signInWithGoogle function in authController.js
Added Google OAuth Route: Added /api/auth/google endpoint in authRoutes.js
Frontend Changes:
Added Google OAuth Script: Added Google Identity Services script to index.html
Updated Auth Component: Implemented proper Google Sign-In functionality in Auth.jsx
Added API Client Method: Added signInWithGoogle method to apiClient.js
Configuration:
Created Setup Guide: Added GOOGLE_OAUTH_SETUP.md with complete setup instructions
Solves #137