Hotfix: Fix sidebar dark mode colors

[chrismaddalena]

This adjusts two color settings for dark mode to improve the look and contrast of active dropdowns in the sidebar.

[Copilot]

Pull request overview

Adjusts dark mode CSS variables to change the sidebar’s active dropdown styling and header text color for improved visual contrast in the sidebar UI.

Changes:

• Updated dark-mode --sidebar-active-text-color
• Updated dark-mode --sidebar-header-text-color

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.60%. Comparing base (ddb43a7) to head (5c16e5d).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #843   +/-   ##
=======================================
  Coverage   91.60%   91.60%           
=======================================
  Files         373      373           
  Lines       21488    21488           
=======================================
  Hits        19685    19685           
  Misses       1803     1803           

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