docs: fix docs dark mode example contrast

[pupuking723]

Fixes #1668.

This updates the Docusaurus example controls to use theme-aware colors instead of hard-coded light mode values. The shared examples now use Docusaurus color variables for labels, inputs, buttons, select toggles, and menu text, with explicit highlighted-item colors for dark mode. The tag group combobox styles also use theme variables for the input wrapper, input, toggle button, menu, and highlighted options.

The change is scoped to documentation examples only and does not touch Downshift runtime behavior.

Verification:

• npm run docs:build
• npx tsc --noEmit -p docusaurus/tsconfig.json
• npx kcd-scripts format docusaurus/pages/combobox.tsx docusaurus/pages/shared.css docusaurus/pages/useCombobox.tsx docusaurus/pages/useMultipleCombobox.tsx docusaurus/pages/useMultipleSelect.tsx docusaurus/pages/useSelect.tsx docusaurus/pages/useTagGroupCombobox.css
• git diff --check

[silviuaavram]

hey @pupuking723 thanks for the PR! I will take a look shortly. One comment: the original issue is about the styles in the downshift docsite, which sits in this repo. If you would also like to take a shot at that, it would be great! Thanks!

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (74ce0f5) to head (54f62a9).
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Additional details and impacted files

@@            Coverage Diff             @@
##            master     #1694    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files           18        69    +51     
  Lines         1726      1922   +196     
  Branches       518       591    +73     
==========================================
+ Hits          1726      1922   +196     

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[pupuking723]

Thanks for reviewing and merging this. I’ll take a look at the docsite styling location as a follow-up and open a separate PR if I can keep it scoped.