Improve UI/UX of Frontend Login Page

**Description**
The current Login page is functional, but the UI/UX feels slightly outdated. Since the login screen is the first interaction for users, improving its design can significantly enhance usability and first-time user experience.

**Issues Observed**
- Text size feels small, affecting readability
- Visual hierarchy between heading, inputs, and CTA is unclear
- Layout can be more balanced and modern
- Login button could be more prominent
- Overall design can be simplified for a cleaner look

**Proposed Solution**
Redesign the **Login page UI only** while keeping:
- Existing content and form fields
- Authentication logic and backend unchanged
- Same validations and functionality

**Planned UI improvements:**
- Increase text size and improve typography
- Better spacing and alignment
- Clear visual hierarchy (heading → fields → CTA)
- Improved button styling and hover states
- Responsive design for mobile and desktop

**Scope**
- ✅ Frontend UI only
- ❌ No backend or authentication changes
- ❌ No new features added

**Contribution Intent**
I’d like to work on this issue and first share a UI proposal (screenshots/mockups) for feedback before implementing the changes.

Please let me know if this aligns with the project goals.