Update Prettier and Rimraf dependencies, fix CSS quotes

[coliff]

Upgraded Prettier to 3.7.0 and Rimraf to 6.1.2 in package.json and package-lock.json for improved compatibility and bug fixes.

Updated CSS selectors in custom.css to use single quotes for consistency and style improvements.

[gemini-code-assist]

Code Review

This pull request upgrades the prettier and rimraf development dependencies and applies formatting changes to a CSS file. The dependency upgrades are a good practice, but updating rimraf has introduced a critical compatibility issue with the project's specified Node.js version. The CSS changes are stylistic and look correct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (95e6a13) to head (59ab1f6).
⚠️ Report is 178 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #1773      +/-   ##
===========================================
+ Coverage   96.99%   100.00%   +3.00%     
===========================================
  Files           2         1       -1     
  Lines        1628         1    -1627     
  Branches      335         0     -335     
===========================================
- Hits         1579         1    -1578     
+ Misses         49         0      -49     

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