Add authentication to my app:

1. Create a Login screen with:
   - Email input field
   - Password input field
   - "Sign In" button
   - "Don't have an account? Sign up" link at bottom

2. Create a Sign Up screen with:
   - Email input field
   - Password input field
   - Confirm password field
   - "Create Account" button
   - "Already have an account? Sign in" link

Use the app's existing color scheme and design language.

Connect the auth screens to the backend:

- When signing up:
  - Validate email format
  - Ensure passwords match
  - Create user account
  - Automatically log in after signup
  - Navigate to home screen

- When logging in:
  - Validate credentials
  - Show error if invalid
  - Navigate to home screen on success
  - Keep user logged in across app restarts

Add authentication protection:
- If user is not logged in, show the Login screen
- After logging in, show the Home screen
- The user should not be able to access Home without logging in
- Check auth status when app launches

Add a logout button in the Settings screen:
- When tapped, show a confirmation: "Are you sure you want to log out?"
- On confirm, clear the session and return to Login screen
- On cancel, stay on Settings

Add a Profile screen that shows:
- User's email address
- Account creation date
- "Edit Profile" button (placeholder for now)
- Logout button at the bottom

Navigate to Profile from a user icon in the header.

Show the user's name in the header when logged in.
If no name is set, show their email instead.

Add a "Forgot Password?" link on the login screen.
When tapped, show a screen where users enter their email
to receive a password reset link.

Add "Sign in with Google" and "Sign in with Apple" buttons
below the email/password form.

Update the tasks feature so each user only sees their own tasks.
When creating a task, automatically associate it with the current user.
When fetching tasks, only return the current user's tasks.