Only attempt to get dominant colour for image mime types.

[peterwilsoncc]

Summary

Modifies the dominant colour detection function to use an allow list of mime types based on image types supported in WordPress. This prevents the feature from running on other media types such as video, zips, etc.

Fixes #1957

Relevant technical choices

Runs the colour detection on the supported mime types

$supported_mime_types = array(
	'image/jpeg',
	'image/png',
	'image/gif',
	'image/webp',
	'image/avif',
);

Introduces the filter dominant_color_supported_mime_types to allow third party developers to extend the feature.

Use of AI Tools

N/A

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 68.89%. Comparing base (7938a41) to head (88a95a1).
⚠️ Report is 15 commits behind head on trunk.

Files with missing lines	Patch %	Lines
plugins/dominant-color-images/helper.php	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #2264      +/-   ##
==========================================
+ Coverage   68.86%   68.89%   +0.02%     
==========================================
  Files          90       90              
  Lines        7610     7617       +7     
==========================================
+ Hits         5241     5248       +7     
  Misses       2369     2369              

Flag	Coverage Δ
multisite	68.89% <90.00%> (+0.02%)	⬆️
single	35.53% <90.00%> (+0.05%)	⬆️

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