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fix(build): compile dynamic imports in the jest babel env (#1287)

preset-env runs with `modules: false`, and the test env only added
`@babel/plugin-transform-modules-commonjs`, which leaves `import()`
expressions untouched. Jest runs CommonJS, so any dependency using a
dynamic import reached Node's ESM loader and threw "A dynamic import
callback was invoked without --experimental-vm-modules".

This surfaced when @testing-library/svelte 5.4.2 moved its wrapper
scaffold behind a dynamic import, breaking the debug panel tests
(#1286).


Claude-Session: https://claude.ai/code/session_01BRtvKfpVqgRdDrcY4x6zVL

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: Rupesh Pandey <pandeyrupesh00@gmail.com>

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