Add Color.WithFullAlpha() extension

[Tyrrrz]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.01%. Comparing base (6726493) to head (d8d7466).
⚠️ Report is 1 commits behind head on prime.

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #75      +/-   ##
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+ Coverage   93.99%   94.01%   +0.01%     
==========================================
  Files         132      132              
  Lines        2616     2622       +6     
  Branches      205      205              
==========================================
+ Hits         2459     2465       +6     
  Misses        113      113              
  Partials       44       44              

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[Copilot]

Pull request overview

Adds a convenience extension for System.Drawing.Color to quickly force a color to be fully opaque, aligning with the existing ColorExtensions helper set.

Changes:

• Add Color.WithFullAlpha() extension that sets alpha to 255 via existing WithAlpha(...).
• Add unit test coverage for WithFullAlpha().

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
PowerKit/Extensions/ColorExtensions.cs	Introduces WithFullAlpha() alongside existing color helpers.
PowerKit.Tests/Extensions/ColorExtensionsTests.cs	Adds a new test validating WithFullAlpha() preserves RGB and sets alpha to 255.

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