[Feature] Add Vintage Sepia Film Background

[avnisinngh]

Description

A nostalgic black-and-white film effect with noise and scratches.

Screenshots

Checklist

• I have checked the existing issues.
• I follow Contributing Guidelines of this project.
• I am a SWOC'25 contributor.

Code of Conduct

• I agree to follow this project's "Code of Conduct".

[github-actions]

Hey @avnisinngh, Welcome to the project Beautiify! 🎊
Thanks for opening an issue! 🙌 Please wait for the issue to be assigned. Happy Coding!! ✨

[github-actions]

Hello @avnisinngh! Your issue #1492 has been closed. Thank you for your contribution!! 🙌