fix(a11y): add correct aria-label on ThemeToggle button

[ShubhamOulkar]

Added a11y test for aria-label in d47d496.

Hydration mismatch:- Initially resolvedTheme is undefined which is rendering wrong aria-label. Fixed in d5a3392

closes #8044

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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[avivkeller]

Aside from my nitpicks above, lgtm

[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟢 98	🟢 100	🟢 100	🟢 100	🔗
/en/about	🟢 99	🟢 97	🟢 100	🟠 88	🔗
/en/about/previous-releases	🟢 99	🟢 93	🟢 100	🟠 89	🔗
/en/download	🟢 96	🟢 100	🟢 100	🟢 100	🔗
/en/blog	🟢 100	🟢 100	🟢 96	🟢 100	🔗

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.02%. Comparing base (cb0d824) to head (821f134).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8045      +/-   ##
==========================================
+ Coverage   73.01%   73.02%   +0.01%     
==========================================
  Files          95       95              
  Lines        8324     8324              
  Branches      214      214              
==========================================
+ Hits         6078     6079       +1     
+ Misses       2245     2244       -1     
  Partials        1        1              

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