🎨 Palette: Improve accessibility of site landmarks

[google-labs-jules]

💡 What: Replaced title attributes with aria-label for the site navigation (<nav>) and sidebar (<aside>) landmarks in the documentation.
🎯 Why: Using title on landmarks creates redundant tooltips for mouse users and provides inconsistent accessible names across screen readers. aria-label is the standard, robust way to label landmark regions, improving navigation for assistive technology users.
📸 Before/After: No visual change, but the "Top Navigation" and "Site Navigation" tooltips will no longer appear on hover.
♿ Accessibility: Provides clear, accessible names for the navigation and complementary landmarks, adhering to WAI-ARIA best practices.

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PR created automatically by Jules for task 8511032869313214652 started by @srod

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Summary by cubic

Replaced title attributes with aria-label on the top navigation and sidebar landmarks to provide clear, consistent accessible names and remove hover tooltips. No visual changes; aligns with WAI-ARIA best practices for landmark labeling.

^{Written for commit 2074f33. Summary will update on new commits.}

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[srod]

Closing: duplicate of #2775 (a11y landmarks)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.54%. Comparing base (2e60e9f) to head (2074f33).
⚠️ Report is 77 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2766   +/-   ##
========================================
  Coverage    99.54%   99.54%           
========================================
  Files           58       58           
  Lines         1105     1105           
  Branches       335      335           
========================================
  Hits          1100     1100           
  Misses           5        5           

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[google-labs-jules]

Closing: duplicate of #2775 (a11y landmarks)

Understood. Acknowledging that this work is duplicate of #2775 and stopping work on this task.