fix: support @knighted/jsx type-only imports in DOM mode.

[knightedcodemonkey]

No description provided.

[Copilot]

Pull request overview

This PR updates the DOM render/typecheck pipeline to handle import type from @knighted/jsx without causing either TypeScript “module not found” diagnostics or runtime export {} syntax errors when code is executed via new Function(...).

Changes:

• Add an ambient declare module '@knighted/jsx' to the DOM-mode JSX type stubs so type-only imports resolve during diagnostics.
• Sanitize transpiled runtime code by stripping empty export {} statements before executing it in the Function-based runtime.
• Add Playwright coverage for both DOM-mode rendering and DOM-mode typechecking with @knighted/jsx type-only imports.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/modules/type-diagnostics.js	Adds an ambient @knighted/jsx module declaration and wires JSX.Element / children typing through it for DOM-mode diagnostics.
src/modules/render-runtime.js	Strips empty export {} statements from transpiled code to avoid Function-runtime syntax errors.
playwright/rendering-modes.spec.ts	Adds a DOM-mode runtime regression test for import type (ensures no preview error output + content renders).
playwright/diagnostics.spec.ts	Adds a DOM-mode typecheck regression test ensuring @knighted/jsx type-only imports resolve cleanly.

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