test: add unit tests for PostCard, CookieBanner and ThemeToggle

[curtiscde]

No description provided.

[netlify]

✅ Deploy Preview for curtiscode-site ready!

Name	Link
🔨 Latest commit	07f0e9d
🔍 Latest deploy log	https://app.netlify.com/projects/curtiscode-site/deploys/6a2b0cf52451a3000731ffdf
😎 Deploy Preview	https://deploy-preview-89--curtiscode-site.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.84%. Comparing base (3fe559b) to head (07f0e9d).
⚠️ Report is 32 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #89       +/-   ##
===========================================
+ Coverage   13.44%   39.84%   +26.40%     
===========================================
  Files          38       42        +4     
  Lines        1406     1546      +140     
  Branches       64       38       -26     
===========================================
+ Hits          189      616      +427     
+ Misses       1211      928      -283     
+ Partials        6        2        -4     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.