Don’t emit color-mix fallback rules inside @keyframes

[thecrypticace]

Fixes #19417

[coderabbitai]

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Walkthrough

This pull request fixes an issue where color-mix fallback rules were being incorrectly emitted inside @keyframes blocks. The fix adds a guard condition to the color-mix polyfill logic to skip fallback generation when inside a keyframes context. A test was added to verify that color-mix() usage inside @keyframes is preserved without fallback injection. The changelog was updated to document this fix.

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Reviewing files that changed from the base of the PR and between 563a016 and 8d97964.

📒 Files selected for processing (3)

• CHANGELOG.md (1 hunks)
• packages/tailwindcss/src/ast.test.ts (1 hunks)
• packages/tailwindcss/src/ast.ts (1 hunks)

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