Add consistent borders to homepage cards in Light and Dark modes

[Adityakumar37]

What kind of change does this PR introduce?

• UI improvement / styling update
• Added consistent borders to homepage card sections (Slack invite card, blog card, upcoming events card) in both Light and Dark modes.

Issue Number:

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

Screenshots/videos:

If relevant, did you update the documentation?

• No documentation changes required for UI styling updates

Summary

This PR fixes the visual inconsistency on the homepage where card sections (Slack invite, blog, upcoming events) had visible borders in Dark Mode but no borders in Light Mode.

Changes made:

• Added border border-gray-300 dark:border-gray-700 dark:shadow-2xl rounded-xl to all card containers
• Ensures consistent visual separation in both Light and Dark modes, improving layout clarity and overall UI structure.

Does this PR introduce a breaking change?

• No

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines

[github-actions]

built with Refined Cloudflare Pages Action

⚡ Cloudflare Pages Deployment

Name	Status	Preview	Last Commit
website	✅ Ready (View Log)	Visit Preview	11e04d4

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1a2d4a6) to head (11e04d4).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files           30        30           
  Lines          633       633           
  Branches       196       196           
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  Hits           633       633           

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