Add Login & Sign-Up Pages with OAuth UI

[MohitPal2005]

🚀 Feature Request: Login & Sign-Up Pages

📌 Overview

Currently, the project does not have dedicated Login and Sign-Up pages.
I would like to contribute by adding clean, responsive authentication UI pages to improve user onboarding and prepare the app for future authentication integration.

---

✨ Proposed Features

• Add /login page
• Add /signup page
• Email & Password input fields
• Responsive and theme-aware UI (light/dark)

---