fix: Empty Background Service Worker Declaration

[Anshumancanrock]

📌 Fixes

Fixes #252

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📝 Summary of Changes

This PR removes the unused and empty background service worker from the extension to improve performance and code cleanliness.

Changes made:

• Removed the "background" section from src/manifest.json that declared an empty service worker
• Deleted the empty src/scripts/background.js file from the repository

Impact:

• Faster extension loading time (no empty worker to initialize)
• Reduced resource usage
• Cleaner codebase with no unused files
• No confusion

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✅ Checklist

• I've tested my changes locally
• I've added tests (if applicable)
• I've updated documentation (if applicable)
• My code follows the project's code style guidelines
• The extension loads and functions correctly in Chrome/Firefox
• No console errors or warnings appear
• All existing features continue to work as expected
• The manifest.json follows Manifest V3 standards

[Anshumancanrock]

@vedansh-5 Kindly review this PR sir and let me know if you want any changes. Thank you!

[vedansh-5]

Lgtm @hpdang! Thanks @Anshumancanrock for your contribution.