Add ColorExtensions for System.Drawing.Color

[Copilot]

Ports the Color extensions from DiscordChatExporter into PowerKit as instance extension methods on System.Drawing.Color.

New extensions

• ToHexString() → "#RRGGBB" hex string
• ToRgb() → RGB value as int (alpha stripped)
• WithAlpha(int alpha) → new Color with the given alpha

var color = Color.FromArgb(128, 0xFF, 0x36, 0x00);

color.ToHexString()   // "#FF3600"
color.ToRgb()         // 0xFF3600
color.WithAlpha(64)   // Color with A=64, same RGB

[Tyrrrz]

Suggested change

	public string ToHex() => $"#{color.R:X2}{color.G:X2}{color.B:X2}";
	public string ToHexString() => $"#{color.R:X2}{color.G:X2}{color.B:X2}";

@copilot

[Copilot]

Done — renamed to ToHexString() in commit 2412ff7.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.02%. Comparing base (eb22eec) to head (2412ff7).
⚠️ Report is 4 commits behind head on prime.

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #67      +/-   ##
==========================================
- Coverage   94.85%   94.02%   -0.83%     
==========================================
  Files         120      126       +6     
  Lines        2333     2478     +145     
  Branches      177      197      +20     
==========================================
+ Hits         2213     2330     +117     
- Misses         86      107      +21     
- Partials       34       41       +7     

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[Copilot]

Pull request overview

Adds System.Drawing.Color extension members to PowerKit, providing small convenience helpers for common color representations and alpha manipulation.

Changes:

• Introduces ColorExtensions with ToHex(), ToRgb(), WithAlpha(int), and ResetAlpha().
• Adds unit tests covering the new color extension behaviors.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
PowerKit/Extensions/ColorExtensions.cs	Adds new instance extension members on System.Drawing.Color for hex/RGB conversion and alpha manipulation.
PowerKit.Tests/Extensions/ColorExtensionsTests.cs	Adds test coverage for ToHex, ToRgb, WithAlpha, and ResetAlpha.

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