Add verification pass for unresolved React components

[WilsonGramer]

Does this PR close any open issues?

I couldn't find a related issue, but this is a feature request from Lane (@codementum).

Give a longer description of what this PR addresses and why it's needed

This PR adds a pass to verifyStudyConfig that checks whether imported React components exist in src/public/. It uses the same logic to fetch modules as ReactComponentController.tsx. If the module doesn't exist, it suggests to check that the component is in src/public/ and not public/.

Provide pictures/videos of the behavior before and after these changes (optional)

In demo-react-trrack/config.json, changing the component name to Missing.tsx produces this error:

Are there any additional TODOs before this PR is ready to go?

TODOs:

• Other component types?