Add HttpHeadersExtensions with TryGetValue and GetValuesOrEmpty

[Copilot]

Ports HttpExtensions from DiscordChatExporter into PowerKit as HttpHeadersExtensions, extending System.Net.Http.Headers.HttpHeaders.

Changes

• PowerKit/Extensions/HttpHeadersExtensions.cs — adds two extension methods on HttpHeaders:
  • GetValuesOrEmpty(string name): returns all header values as IEnumerable<string>, or an empty sequence if absent
  • TryGetValue(string name): returns all header values joined with ", " as string, or an empty string if absent; delegates to GetValuesOrEmpty
• PowerKit.Tests/Extensions/HttpHeadersExtensionsTests.cs — covers found, not found, and multi-value cases for both methods

Usage

string value = response.Headers.TryGetValue("X-Custom-Header");

IEnumerable<string> values = response.Headers.GetValuesOrEmpty("X-Custom-Header");

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.07%. Comparing base (eb22eec) to head (3efdfc2).
⚠️ Report is 6 commits behind head on prime.

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #68      +/-   ##
==========================================
- Coverage   94.85%   94.07%   -0.79%     
==========================================
  Files         120      128       +8     
  Lines        2333     2496     +163     
  Branches      177      198      +21     
==========================================
+ Hits         2213     2348     +135     
- Misses         86      107      +21     
- Partials       34       41       +7     

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[Copilot]

Pull request overview

Ports a header helper into PowerKit by adding an HttpHeaders extension method that attempts to retrieve a header value as a string?, with accompanying unit tests.

Changes:

• Added HttpHeadersExtensions.TryGetValue(string name) for System.Net.Http.Headers.HttpHeaders
• Added tests covering present, absent, and multi-value headers

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
PowerKit/Extensions/HttpHeadersExtensions.cs	Introduces the HttpHeaders extension method that retrieves header values as a nullable string
PowerKit.Tests/Extensions/HttpHeadersExtensionsTests.cs	Adds xUnit coverage for the new extension method’s behaviors

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