Allow whitespace around @source inline() arg

[wongjn]

Summary

Inspired by #19460, relaxes whitespace syntax around @source inline(…):

Before

/* ❌ Error: `@source` paths must be quoted. */
@source inline( "underline" );
@source inline(
  "underline"
);

After

/* ✅ Generates the class names as normal. */
@source inline( "underline" );
@source inline(
  "underline"
);

Test plan

Added tests to packages/tailwindcss/src/index.test.ts.

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📥 Commits

Reviewing files that changed from the base of the PR and between 100fe0c and fb140a0.

📒 Files selected for processing (2)

• packages/tailwindcss/src/index.test.ts (1 hunks)
• packages/tailwindcss/src/index.ts (1 hunks)

Walkthrough

The PR adds tests verifying the @source inline(...) directive accepts surrounding whitespace and newlines around its argument and still expands to the same CSS. It also trims whitespace from extracted inline source paths during parsing, normalizing path values after slicing.

Pre-merge checks

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: allowing whitespace around the @source inline() argument, which is the primary focus of all modifications.
Description check	✅ Passed	The description is clearly related to the changeset, providing context about the whitespace syntax relaxation with before/after examples and referencing the test plan.

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[thecrypticace]

Thanks!