Add Login Page

[sunami09]

• [x] Implemented a basic login page with Firebase Authentication integration.
• [x] Added fields for user Email and Password with basic validation.
• [x] Created a Login button that triggers Firebase's signInWithEmailAndPassword method.
• [x] Displayed error messages below the login form if authentication fails.
• [x] Styled the page with a consistent design to match the overall app theme.
• [x] Included a 'Register here' link for users without an account, redirecting them to the registration page.

[sunami09]

Screenshots:

• Login Page:

[sunami09]

10 Merged