Builder-Vite: Add null character prefix to virtual file IDs in code generator plugin

[valentinpalkovic]

Closes #

What I did

Cleaned up the code for resolving and loading virtual files in the Vite builder.

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  • bug: Internal changes that fixes incorrect behavior.
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Greptile Summary

This PR modifies the virtual file handling in the Vite builder for Storybook, improving compatibility with Vite's virtual module system.

• Added resolvedVirtualPath function in code-generator-plugin.ts to prefix virtual file IDs with a null byte
• Updated virtual file ID resolution throughout the plugin to use the new resolvedVirtualPath function
• Removed leading forward slashes from virtual file paths in virtual-file-names.ts
• These changes ensure better alignment with Vite's expected format for virtual modules

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[IanVS]

Thanks for doing this, but it looks like I was wrong. I found a guide to virtual modules which I'm pretty sure must be new, or at least I don't remember seeing it before, but it's very helpful: https://vitejs.dev/guide/api-plugin.html#virtual-modules-convention. Looks like you did it the right way, though I guess maybe a slightly cleaner approach is to create another constant for the ID used in resolving.

[valentinpalkovic]

@IanVS Can you take another look?

[greptile-apps]

LGTM

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[IanVS]

Seems like a nice cleanup.

[valentinpalkovic]

Superseded by #28984