Add login form with validation and authentication state

[bhumanai]

Summary

• Introduces a login form component with email and password validation
• Implements client-side validation rules for email format and password strength
• Adds authentication state management with login/logout functionality
• Persists authentication state and user email in localStorage
• Displays user email and logout button when authenticated
• Restricts access to main app content until user is logged in

Changes

Login Form Component

• Created LoginForm React component with controlled inputs for email and password
• Email validation using regex to ensure proper email format
• Password validation checks for minimum length, uppercase, lowercase, numeric, and special characters
• Displays real-time password requirement feedback with checkmarks
• Shows error messages for invalid or missing inputs
• Disables inputs and submit button during submission

Authentication State Management

• Added isAuthenticated and userEmail state variables
• Implemented handleLogin to set authentication state and store in localStorage
• Implemented handleLogout to clear authentication state and localStorage
• On app mount, checks localStorage to restore authentication state
• Conditionally renders LoginForm if not authenticated
• Shows welcome message with user email and logout button when authenticated

UI Updates

• Login form styled with Tailwind CSS for a modern dark theme
• Main app header updated to include user greeting and logout button

Test plan

• Verify login form renders when not authenticated
• Test email validation with valid and invalid inputs
• Test password validation with various password strengths
• Confirm login sets authentication state and persists in localStorage
• Confirm logout clears authentication state and localStorage
• Verify main app content is only accessible when logged in
• Check UI updates to show user email and logout button after login

🌿 Generated by Terry

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ℹ️ Tag @terragon-labs to ask questions and address PR feedback

📎 Task: https://www.terragonlabs.com/task/641000ce-65f7-4a8a-ba44-5ddfcaf4ea56

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