fix: collect virtual module CSS in vite dev

[katywings]

Changes

1. Implements new css fixture test for virtual modules
2. Fixes dev css crawling for virtual modules, by using built-in method from vite to fetch module deps
3. Converts \0virtual:module.css to /@id/__x00__virtual:module.css in manifest, to fix dynamic import of virtual modules
   • Related feat(vite-server): handle vite virtual module ids withastro/astro#13902
4. Patches data-vite-dev-id attributes for style tags of virtual modules

Fixes tested with

• css fixture and nitro 2
• css fixture and nitro 3.0.1-alpha.1
• solidbase (nitro 2)
• nitropage (nitro 3.0.1-alpha.1)

Other information

Before change 2+3: https://github.com/user-attachments/assets/630e827b-5241-403f-9a70-5d4ccbb0db90
After: https://github.com/user-attachments/assets/7d3af2e8-5211-4f05-b8de-9f14ef153549

Before change 4: https://github.com/user-attachments/assets/e8e59e0b-800f-42ab-b8df-f452ea8d0de7
After: https://github.com/user-attachments/assets/a19627dd-232e-41b1-b72f-f54714b5df42

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Latest commit: d1a23f5

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