Add missing light mode border in Community section

[Adityakumar37]

What kind of change does this PR introduce?

A bugfix — added missing border for the Community section cards in Light Mode.

Issue Number:

• Closes 🐛 Bug: Missing Card Borders in Light Mode on Homepage #1926

Screenshots/videos:

If relevant, did you update the documentation?

Not applicable.

Summary

This PR fixes the missing border in Light Mode for the community cards (Slack, Blog, and GitHub links).
Dark mode styles are untouched.
This improves the visual consistency and UI clarity in Light Mode.

Does this PR introduce a breaking change?

No breaking changes introduced.

Checklist

• Read, understood, and followed the contributing guidelines.

[github-actions]

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Name	Status	Preview	Last Commit
website	✅ Ready (View Log)	Visit Preview	afc6dc0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dcf4ea4) to head (afc6dc0).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1945   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           30        30           
  Lines          633       633           
  Branches       196       196           
=========================================
  Hits           633       633           

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