fix replace-string-ref to delete refs on unmount

[alexbit-codemod]

Summary

• Update replace-string-ref callback refs to delete this.refs… when React passes null on unmount, matching string-ref property removal semantics (aligned with codemod/codemod#1310).
• Add a dedicated delete-ref-on-unmount fixture and update existing expected outputs; document the behavior in the package README.

Test plan

• pnpm test in codemods/replace-string-ref (11 fixtures pass)
• Spot-check transformed callback refs still assign on mount and delete on unmount for identifier and non-identifier ref names

Made with Cursor

[alexbit-codemod]

/codex-review

[Copilot]

Pull request overview

Updates replace-string-ref to preserve string-ref cleanup semantics by deleting ref properties when React supplies null.

Changes:

• Generate callbacks that assign refs on mount and delete them on unmount.
• Add and update transformation fixtures.
• Document cleanup behavior and broaden an unrelated CLI error assertion.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
codemods/replace-string-ref/scripts/codemod.ts	Adds conditional ref cleanup.
codemods/replace-string-ref/README.md	Documents unmount semantics.
codemods/replace-string-ref/tests/delete-ref-on-unmount/input.tsx	Adds cleanup fixture input.
codemods/replace-string-ref/tests/delete-ref-on-unmount/expected.tsx	Verifies generated cleanup.
codemods/replace-string-ref/tests/delete-ref-on-unmount/metrics.json	Verifies fixture metrics.
codemods/replace-string-ref/tests/non-identifier-ref-name/expected.tsx	Covers bracket-property cleanup.
codemods/replace-string-ref/tests/namespace-import/expected.tsx	Updates namespace-import output.
codemods/replace-string-ref/tests/multiple-string-refs/expected.tsx	Updates multiple-ref output.
codemods/replace-string-ref/tests/export-default-class/expected.tsx	Updates exported-class output.
codemods/replace-string-ref/tests/class-component-named-import/expected.tsx	Updates named-import output.
codemods/replace-string-ref/tests/class-component-default-import/expected.tsx	Updates default-import output.
codemods/replace-string-ref/tests/class-component-custom-import-names/expected.tsx	Updates aliased-import output.
codemods/create-element-to-jsx/scripts/error-tests.mjs	Accepts another CLI runtime diagnostic.

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