fix(css): :global in css modules

[DonIsaac]

What does this PR do?

Fixes #18170

How did you verify your code works?

I've added a test

[robobun]

^{Updated 2:34 PM PT - Mar 17th, 2025}

❌ @DonIsaac, your commit 4509580 has 3 failures in Build #13403:

• test/js/web/fetch/fetch.test.ts - 1 failing on 🍎 13 aarch64
• test/cli/install/bun-install-registry.test.ts - 1 failing on 🪟 2019 x64
• test/js/bun/net/tcp.test.ts - code STATUS_HEAP_CORRUPTION on 🪟 2019 x64

---

🧪   try this PR locally:

bunx bun-pr 18257

[zackradisic]

lgtm