fix: Vite 8 (Rolldown) compatibility for content scripts

[sheldhur]

Summary

Two fixes for Vite 8 (Rolldown) compatibility when building Chrome extensions with content scripts:

1. Duplicate refIds: this.emitFile({ type: "chunk", name: basename(file) }) returns the same refId for different files with the same basename (e.g. seller/content.tsx, cmp/content.tsx, marketplace/content.tsx). Only the first script gets its fileName resolved; the rest fail with Content script fileName is undefined.

2. Wrong MAIN world loader path: The loader uses ./${fileName.split("/").at(-1)} which loses the subdirectory, producing a broken path.

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Latest commit: a19f489

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[sheldhur]

@Toumash can you look at this? I can update the failed tests if you're ready to merge it

[silas]

I'm not sure if it's the same issue or not (I've haven't dug into it yet), but I also had an issue where I had a content script and service_worker script both named main.ts (but in different directories), and the generated service-worker-loader.js script ended up importing the content module/file instead of the service_worker module/file.

I'm using Vite 8.