Radio/checkbox: Include description in label, set correct label styling

[oliver3]

Closes #1002

This change is for all radio buttons and checkboxes in the application, for example:

• ChoiceList Radio component (ladle)
• User create (preview)
• Recounted (preview)
• Polling station form (preview)

[github-actions]

Sigrid maintainability feedback

✅ You wrote maintainable code and achieved your objective of 3.5 stars

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Sigrid compared your code against the baseline of 2025-02-17.

👍 What went well?

You fixed or improved 0 refactoring candidates.

👎 What could be better?

You did not introduce any technical debt during your changes, great job!

📚 Remaining technical debt

1 refactoring candidates didn't get better or worse, but are still present in the code you touched.

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⭐️ Sigrid ratings

System property	System on 2025-02-17	Before changes	New/changed code
Volume	5.2	N/A	N/A
Duplication	4.3	5.5	5.5
Unit Size	2.4	5.5	5.5
Unit Complexity	3.4	N/A	N/A
Unit Interfacing	3.0	N/A	N/A
Module Coupling	4.0	N/A	N/A
Component Independence	2.8	N/A	N/A
Component Entanglement	3.7	N/A	N/A
Maintainability	3.6	5.5	5.5

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.26%. Comparing base (126ba15) to head (f9c077e).
Report is 9 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1031      +/-   ##
==========================================
+ Coverage   90.19%   90.26%   +0.07%     
==========================================
  Files         249      249              
  Lines       13090    13181      +91     
  Branches     1338     1341       +3     
==========================================
+ Hits        11806    11898      +92     
+ Misses       1190     1187       -3     
- Partials       94       96       +2     

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