docs: document wikimedia/less.php 4.x to 5.x upgrade#504
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Adds a less.php dependency entry under the Dependencies section and a breaking change bullet under LESS Preprocessing for the math expression behaviour change in CSS custom properties introduced with Less.js 3.5+. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Documents the less.php 4.x → 5.x upgrade included in Flarum 2.x (flarum/framework#4225).
#### wikimedia/less.phpentry under the Dependencies section noting the version bump and that most PHP-level breaking changes were handled internally by core### LESS Preprocessingfor the math expression behaviour change in CSS custom properties: arithmetic inside--custom-propertydeclarations is no longer evaluated by the LESS compiler (aligns with Less.js 3.5+), with before/after code examples and acalc()alternativeThe other less.php 5.x breaking changes (
import_callbackremoval,AllParsedFiles()removal, etc.) were all internal to Flarum core and do not require any action from extension authors.Test plan
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