Add changelog entry for #20591

[RobinMalfait]

Adds the changelog entry for #20591. The entry was missing because the fork of that PR did not allow maintainer edits.

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[coderabbitai]

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Reviewing files that changed from the base of the PR and between a982d5b and 610a6a8.

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• CHANGELOG.md

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Walkthrough

The Unreleased changelog adds a fix entry stating that single-digit hexadecimal escapes in theme variable and @utility names are decoded according to the CSS specification. It gives --color-\0 as an example.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 610a6

This change documents the escape-decoding fix without changing runtime behavior. No concrete merge risk is identified.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly identifies the main change: adding a changelog entry for PR #20591.
Description check		The description directly explains that the pull request adds the missing changelog entry for PR #20591.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[greptile-apps]

Confidence Score: 5/5

[Low impact] This documentation-only PR appears safe to merge.

_{Reviews (1) · Last reviewed commit: "Add changelog entry for #20591" · Reviewed by Greptile}