This PR adds an integration test with Vue where we use a 1000 components
and where each component references a CSS file via `@reference`. Each
component has a unique class that uses `@apply`.
There are some discussions in
https://github.com/tailwindlabs/tailwindcss/discussions/16429 that
mention that this causes OOM issues. Right now I can't reproduce that,
and even with a 1000 components, it produces CSS in a reasonable time:
```
vite v7.3.3 building client environment for production...
✓ 2011 modules transformed.
dist/index.html 0.23 kB │ gzip: 0.18 kB
dist/assets/index-DNVNFkYQ.css 106.65 kB │ gzip: 10.79 kB
dist/assets/index-B8v7EbAN.js 223.84 kB │ gzip: 49.81 kB
✓ built in 3.17s
```
I also started a Vite server and triggered file changes to see if the
memory would grow forever, which it didn't. After a 1000 changes,
everything still behaves smoothly:
<img width="1694" height="1856" alt="image"
src="https://github.com/user-attachments/assets/b16800ae-4dce-4f0d-9d97-25f4cab21c1c"
/>
Making changes manually to a single component, result in proper HMR
request that update the browser:
https://github.com/user-attachments/assets/5c79ffc6-2329-4341-9d25-82b000093e31
This test is here to make sure that it keeps working in the future.
---
If I remove all `@reference` references, and usages of `@apply`, then
the build time is indeed faster:
```
vite v7.3.3 building client environment for production...
✓ 2011 modules transformed.
dist/index.html 0.23 kB │ gzip: 0.18 kB
dist/assets/index-CcxXccJ1.css 106.61 kB │ gzip: 10.76 kB
dist/assets/index-M92YFF0G.js 223.84 kB │ gzip: 49.81 kB
✓ built in 1.97s
```
So we go from `1.97s` → `3.17s`, which is a `1.2s` increase when you use
`@reference` with `@apply` in 1000 files for a fresh build.
I also saw some comments about the CSS growing whenever `@reference` was
used, but as you can see in the snippets above they are at a stable
size.
## Test plan
1. All tests still pass
[ci-all] For testing on Windows / macOS
---------
Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>
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