test(vite-node): test css import

[hi-ogawa]

Description

Related

• fix(vite-node): fix buildStart on Vite 6 #7480
• fix: await client buildStart on top level buildStart vitejs/vite#19624
• fix(vite-node): fix missing buildStart #7652

There were some files importing css, but weren't used as tests. This verifies css import is working on vite-node.

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