chore: Increase specificity for admin urls (django 5.2)

[fsbraun]

This PR removes underline text decorations introduced by django 5.2 (through changes in specificity):

Summary by Sourcery

Bug Fixes:

• Remove unwanted underlines from navigation links in the admin interface.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request resolves an issue with unwanted underlines on admin navigation links in Django 5.2 by adjusting CSS specificity and explicitly removing text decoration.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Improved CSS specificity and explicitly styled navigation links.	Increased the specificity of the navigation list selector. Added a style rule to remove text decoration from navigation links.	private/sass/base.scss djangocms_frontend/static/djangocms_frontend/css/base.css

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[sourcery-ai]

Hey @fsbraun - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.68%. Comparing base (cbaa073) to head (94522fd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #278   +/-   ##
=======================================
  Coverage   88.68%   88.68%           
=======================================
  Files         124      124           
  Lines        3366     3366           
  Branches      283      283           
=======================================
  Hits         2985     2985           
  Misses        264      264           
  Partials      117      117           

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