feat: react mode baseline type checking.

[knightedcodemonkey]

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[Copilot]

Pull request overview

Adds a React-mode-aware TypeScript diagnostics pipeline that can hydrate @types/react/@types/react-dom (and transitive deps) from CDN into the in-browser virtual FS, while also updating the JSX transform runtime integration and adding regression coverage + documentation.

Changes:

• Implement lazy React type graph hydration + virtual node_modules module resolution for browser TypeScript diagnostics.
• Rename/upgrade JSX transpile integration to jsxTransform / transformJsxSource, including runtime import handling.
• Add Playwright coverage and docs describing the in-browser typechecking architecture.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/modules/type-diagnostics.js	Adds React-mode type package hydration, reference parsing, and a richer TS host/module resolution bridge.
src/modules/render-runtime.js	Switches to transformJsxSource and adds runtime import stripping + React import binding preamble.
src/modules/defaults.js	Updates the default React example to use proper React imports and typed MouseEvent.
src/modules/cdn.js	Adds jsxTransform spec and introduces getTypePackageFileUrls for fetching @types/* files.
src/bootstrap.js	Updates modulepreload list to preload jsxTransform instead of jsxTranspile.
src/app.js	Wires getTypePackageFileUrls + render mode into the type diagnostics controller.
playwright/app.spec.ts	Adds an e2e regression ensuring React-mode type hydration avoids malformed URL fetches.
docs/type-checking.md	New documentation describing browser typechecking + React-mode type hydration approach.
docs/next-steps.md	Adds a follow-up checklist item describing the preprocessor-first reference parsing hardening effort.

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