feat: Implement complete Supabase authentication system with profile management (Fixes #300)

[Muneerali199]

🎯 Overview

This PR implements a complete authentication system using Supabase, replacing the previous JWT-based authentication. It also adds a comprehensive user profile management system with responsive UI across all pages.

✨ Features Implemented

Authentication Pages

• ✅ Login Page - Sign in with email/password
• ✅ Signup Page - Account creation with email verification
• ✅ Forgot Password - Password reset request flow
• ✅ Reset Password - New password setup page
• ✅ Profile Page - Complete user profile management

Profile Management

• View and edit user information (name, phone, bio)
• Change password functionality
• Avatar display with user initials
• Account information (member since date)
• Email display (read-only for security)

UI/UX Enhancements

• Navbar Profile Dropdown: User avatar, name, profile link, and logout
• Sidebar Profile Card: User info display with direct profile access
• Responsive Design: Mobile-first approach for all screen sizes
• Dark Mode: Complete dark mode support across all pages
• Loading States: Smooth transitions with loading indicators
• Toast Notifications: Real-time feedback for all actions

🔐 Security Features

• Supabase handles password hashing and storage
• Email verification required on signup
• Protected routes with automatic redirect to login
• Session management with auto-refresh tokens
• Email field is read-only (cannot be changed)
• Password reset links expire after 1 hour

📱 Responsive Design

All authentication pages and profile management are fully responsive:

• Mobile (320px+)
• Tablet (768px+)
• Desktop (1024px+)
• Large screens (1440px+)

🐛 Bug Fixes

• Fixed logout functionality to properly use signOut method
• Resolved profile dropdown click-outside behavior
• Fixed auth state persistence across page refreshes
• Corrected session management issues

📦 Dependencies Added

"@supabase/supabase-js": "latest"

🔧 Configuration

Added environment variables in .env.local:
•  NEXT_PUBLIC_SUPABASE_URL
•  NEXT_PUBLIC_SUPABASE_ANON_KEY

📝 Documentation

Added comprehensive AUTHENTICATION_SETUP.md with:
•  Complete feature list
•  Usage examples for developers
•  User guide for authentication flow
•  Troubleshooting section
•  Security notes

🧪 Testing Checklist

User can sign up with email verification
User can sign in with email/password
User can request password reset
User can update password from reset link
User can view profile page
User can edit profile information
User can change password from profile
Logout functionality works correctly
Profile dropdown opens/closes properly
Sidebar shows user information when logged in
Protected routes redirect to login
Dark mode works across all pages
Responsive design works on all screen sizes

🔗 Related Issues

Fixes #300



video =https://drive.google.com/file/d/1QGeWDF4BIO7schJmk9590bOw9lV39xy5/view?usp=sharing

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