refactor: migrate package runtime to ESM

[chenjiahan]

Summary

• migrate the package and runtime helper files to native ESM semantics
• update source imports, path resolution, release tooling, and workflow commands to use .js outputs consistently
• adjust test fixtures and compilation helpers for ESM entries while keeping the existing refresh behavior covered

[Copilot]

Pull request overview

Migrates the package and its injected runtime/client helpers to native ESM, updating build/test/release wiring to consistently use .js ESM outputs.

Changes:

• Convert client runtime helper files (client/*) from CommonJS to ESM exports/imports.
• Update source/runtime path resolution and internal TS imports to ESM-friendly semantics (.js extensions, createRequire, import.meta.dirname).
• Refactor tests and fixtures to use ESM modules and async/await compilation flow; update release tooling/workflow commands.

Reviewed changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/test.spec.ts	Refactors compilation helper to return a Promise and migrates tests to async/await + ESM path handling.
test/fixtures/query/index.js	Switches fixture entry to ESM import with explicit extension + query.
test/fixtures/query/foo.js	Converts fixture module export to ESM default export.
test/fixtures/loader/loader.cjs	Adds a CJS custom loader fixture to remain compatible with loader resolution.
test/fixtures/loader/index.js	Converts fixture entry from require to ESM import.
test/fixtures/default/index.js	Converts fixture entry/module to ESM.
test/fixtures/custom/index.js	Converts fixture entry from require to ESM import.
src/paths.ts	Updates runtime/client path resolution for ESM (import.meta.dirname, createRequire).
src/options.ts	Minor formatting cleanup in option docs.
src/index.ts	Updates internal imports to include .js extensions for NodeNext ESM output.
scripts/release.js	Adjusts ESM-friendly URL-to-path handling for release script.
rslib.config.ts	Introduces rslib build configuration (bundle + dts).
README.md	Updates usage snippet and removes deprecated/extra config shown previously.
package.json	Switches package to ESM (type: module) and updates export to dist/index.js; adjusts release script path.
client/refreshUtils.js	Migrates refresh utils from CJS to ESM imports/exports.
client/reactRefreshEntry.js	Migrates entry injection helper from CJS require to ESM import.
client/reactRefresh.js	Migrates runtime wrapper from CJS to ESM exports and updates imports.
.github/workflows/release.yml	Updates workflow to execute the new scripts/release.js entrypoint.

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