Fix extraction of quoted arbitrary variants in v3

[supermadu7]

Summary

Fixes #18387.

The v3 default extractor did not capture the complete candidate when a standard variant preceded an arbitrary selector containing quoted values, such as focus-visible:[&:not([aria-selected="true"])]:bg-red-500.

The quote-aware pattern allowed quote characters in the standard-variant portion, causing extraction to begin at the surrounding class or className attribute and split the candidate. This change excludes single and double quotes from that portion of the pattern while continuing to allow quotes inside arbitrary variants.

Regression tests cover both single- and double-quoted selectors with preceding focus-visible and hover variants.

[ci-all]

Test plan

• npx jest tests/default-extractor.test.js tests/arbitrary-variants.test.js --runInBand
• npm test -- --runInBand

Results:

• 86 test suites passed
• 1,060 tests passed
• 1 test marked todo
• 4 snapshots passed

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

_{Reviews (3): Last reviewed commit: "update comment" | Re-trigger Greptile}

[RobinMalfait]

Thanks!