feat: add category pages with unique backgrounds

[AbhijeetMukherjee-ML]

name: Pull Request 🔄
description: Submit a Pull Request
title: "[PR]: feat: add category pages with unique backgrounds"
body:

• type: textarea
  id: description
  attributes:
  label: Description
  value: |
  Each category now has its own dedicated page with a unique
  background that matches its theme.

  • 🎮 Games page → arcade/neon gaming background
  • 🔢 Math page → dark teal blueprint with equations
  • 🔐 Utilities page → glowing circuit board background

• type: dropdown
  id: type-of-change
  attributes:
  label: Type of Change
  value: UI/UX improvement

• type: textarea
  id: related-issue
  attributes:
  label: Related Issue
  value: "Closes Add unique background themes for each category page #228 "

• type: textarea
  id: testing
  attributes:
  label: How Has This Been Tested?
  value: |
  - [x] Tested on macOS
  - [x] Multiple test runs completed
  - [x] Verified backgrounds load on all 3 pages
  - [x] Verified dark/light mode works on all pages
  - [x] Verified nav links work between pages

• type: textarea
  id: environment-info
  attributes:
  label: Environment
  value: |
  Python Version: N/A (frontend only)
  OS: macOS

• type: checkboxes
  id: checklist
  attributes:
  label: Checklist
  options:
  - label: "I have been assigned this issue before raising this PR"
  checked: true
  - label: "My code follows the project's style guidelines"
  checked: true
  - label: "I have tested my code thoroughly"
  checked: true
  - label: "My project runs without errors"
  checked: true
  - label: "No external dependencies added (unless necessary)"
  checked: true
  - label: "I have updated the README.md (if adding new project)"
  checked: false
  - label: "I am participating in GSSoC 2026"
  checked: true

[vercel]

@C4aZy is attempting to deploy a commit to the Anuj's projects Team on Vercel.

A member of the Team first needs to authorize it.

[AbhijeetMukherjee-ML]

@steam-bell-92 please check

[github-actions]

🎉 Thank you for your contribution!

Your Pull Request has been merged successfully.

We appreciate the time and effort you put into improving this project. Contributions like yours help the repository grow and stay useful for everyone.

If you'd like to contribute again, please check the open issues and make sure you are assigned before opening another Pull Request.

Thanks again for your support! 🙌

[github-actions]

Thanks @C4aZy! I've added you to the contributors list.