Fix HTML entity handling in JSX transformer

[bradchristensen]

This PR fixes the JSX transformer incorrectly emitting HTML entities as-is (as plaintext) when they're supposed to be converted into the characters they encode (e.g. & should be replaced by &, ' should be replaced by ' and so on).

[Copilot]

Pull Request Overview

This PR fixes HTML entity handling in the JSX transformer to correctly decode HTML entities into their corresponding characters instead of emitting them as plaintext. The fix ensures that entities like &, ", and · are properly converted to their actual characters (&, ", ·) during JSX transformation.

Key Changes

• Updated regex group indices in the HTML entity replacer function to match the correct capture groups
• Added null checks to prevent processing empty captures
• Fixed entity decoding for decimal, hexadecimal, and named HTML entities

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/transformers/jsxtransforms/jsx.go	Fixed regex group indices and added safety checks for HTML entity processing
testdata/baselines/reference/submodule/conformance/tsxReactEmitEntities.js	Updated test baseline showing correct entity decoding (e.g., · → ·)
testdata/baselines/reference/submodule/conformance/tsxReactEmitEntities.js.diff	Updated diff baseline reflecting the entity handling fix
testdata/baselines/reference/submodule/conformance/tsxReactEmitNesting.js	Updated baseline showing &lt;x&gt; correctly decoded to <x>
testdata/baselines/reference/submodule/conformance/tsxReactEmitNesting.js.diff	Updated diff baseline for the nesting test case

[bradchristensen]

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