chore(deps): update tailwindcss monorepo to v4.1.18 (#360)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [@tailwindcss/postcss](https://tailwindcss.com)
([source](https://redirect.github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-postcss))
| [`4.1.17` ->
`4.1.18`](https://renovatebot.com/diffs/npm/@tailwindcss%2fpostcss/4.1.17/4.1.18)
|
![age](https://developer.mend.io/api/mc/badges/age/npm/@tailwindcss%2fpostcss/4.1.18?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@tailwindcss%2fpostcss/4.1.17/4.1.18?slim=true)
|
| [tailwindcss](https://tailwindcss.com)
([source](https://redirect.github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss))
| [`4.1.17` ->
`4.1.18`](https://renovatebot.com/diffs/npm/tailwindcss/4.1.17/4.1.18) |
![age](https://developer.mend.io/api/mc/badges/age/npm/tailwindcss/4.1.18?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/tailwindcss/4.1.17/4.1.18?slim=true)
|

---

### Release Notes

<details>
<summary>tailwindlabs/tailwindcss
(@&#8203;tailwindcss/postcss)</summary>

###
[`v4.1.18`](https://redirect.github.com/tailwindlabs/tailwindcss/blob/HEAD/CHANGELOG.md#4118---2025-12-11)

[Compare
Source](https://redirect.github.com/tailwindlabs/tailwindcss/compare/v4.1.17...v4.1.18)

##### Fixed

- Ensure validation of `source(…)` happens relative to the file it is in
([#&#8203;19274](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19274))
- Include filename and line numbers in CSS parse errors
([#&#8203;19282](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19282))
- Skip comments in Ruby files when checking for class names
([#&#8203;19243](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19243))
- Skip over arbitrary property utilities with a top-level `!` in the
value
([#&#8203;19243](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19243))
- Support environment API in `@tailwindcss/vite`
([#&#8203;18970](https://redirect.github.com/tailwindlabs/tailwindcss/pull/18970))
- Preserve case of theme keys from JS configs and plugins
([#&#8203;19337](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19337))
- Write source maps correctly on the CLI when using `--watch`
([#&#8203;19373](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19373))
- Handle special defaults (like `ringColor.DEFAULT`) in JS configs
([#&#8203;19348](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19348))
- Improve backwards compatibility for `content` theme key from JS
configs
([#&#8203;19381](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19381))
- Upgrade: Handle `future` and `experimental` config keys
([#&#8203;19344](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19344))
- Try to canonicalize any arbitrary utility to a bare value
([#&#8203;19379](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19379))
- Validate candidates similarly to Oxide
([#&#8203;19397](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19397))
- Canonicalization: combine `text-*` and `leading-*` classes
([#&#8203;19396](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19396))
- Correctly handle duplicate CLI arguments
([#&#8203;19416](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19416))
- Don’t emit color-mix fallback rules inside `@keyframes`
([#&#8203;19419](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19419))
- CLI: Don't hang when output is `/dev/stdout`
([#&#8203;19421](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19421))

</details>

---

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