fix(react): preserve first-line leading whitespace with entity JSX text

[kdy1]

Summary\n- preserve first-line leading whitespace in entity-aware JSX text handling\n- keep existing trimming behavior for non-first lines\n- add fixtures for issue #11541 (single-line and multiline regression cases)\n\n## Testing\n- cargo test -p swc_ecma_transforms_react issue_11541 -- --ignored\n\nFixes #11541

[changeset-bot]

⚠️ No Changeset found

Latest commit: cc2444d

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[github-actions]

Binary Sizes

File	Size
swc.linux-x64-gnu.node	28M (28573896 bytes)

Commit: 79fbcfd

[codspeed-hq]

Merging this PR will not alter performance

✅ 184 untouched benchmarks

---

_{Comparing codex/fix-11541-jsx-whitespace (cc2444d) with main (366a16b)¹}

Footnotes

1. No successful run was found on main (40bbdd2) during the generation of this report, so 366a16b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩