chore(deps): update tailwindcss monorepo to v4.1.16 (#828)

This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
| [@tailwindcss/postcss](https://tailwindcss.com)
([source](https://redirect.github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-postcss))
| devDependencies | patch | [`4.1.15` ->
`4.1.16`](https://renovatebot.com/diffs/npm/@tailwindcss%2fpostcss/4.1.15/4.1.16)
| [![OpenSSF
Scorecard](https://api.securityscorecards.dev/projects/github.com/tailwindlabs/tailwindcss/badge)](https://securityscorecards.dev/viewer/?uri=github.com/tailwindlabs/tailwindcss)
|
| [tailwindcss](https://tailwindcss.com)
([source](https://redirect.github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss))
| devDependencies | patch | [`4.1.15` ->
`4.1.16`](https://renovatebot.com/diffs/npm/tailwindcss/4.1.15/4.1.16) |
[![OpenSSF
Scorecard](https://api.securityscorecards.dev/projects/github.com/tailwindlabs/tailwindcss/badge)](https://securityscorecards.dev/viewer/?uri=github.com/tailwindlabs/tailwindcss)
|

---

### Release Notes

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

###
[`v4.1.16`](https://redirect.github.com/tailwindlabs/tailwindcss/blob/HEAD/CHANGELOG.md#4116---2025-10-23)

[Compare
Source](https://redirect.github.com/tailwindlabs/tailwindcss/compare/v4.1.15...v4.1.16)

##### Fixed

- Discard candidates with an empty data type
([#&#8203;19172](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19172))
- Fix canonicalization of arbitrary variants with attribute selectors
([#&#8203;19176](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19176))
- Fix invalid colors due to nested `&`
([#&#8203;19184](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19184))
- Improve canonicalization for `& > :pseudo` and `& :pseudo` arbitrary
variants
([#&#8203;19178](https://redirect.github.com/tailwindlabs/tailwindcss/pull/19178))

</details>

---

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<!-- This is an auto-generated description by cubic. -->
---

## Summary by cubic
Updated Tailwind CSS packages to v4.1.16 to pull in upstream fixes for
arbitrary variants, attribute selectors, and nested “&” color
resolution. No app code changes or migration required.

- **Dependencies**
  - tailwindcss: 4.1.15 → 4.1.16
  - @tailwindcss/postcss: 4.1.15 → 4.1.16

<!-- End of auto-generated description by cubic. -->

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

bun.lock

@@ -50,14 +50,14 @@
   },
   "devDependencies": {
     "@fumadocs/cli": "1.0.3",
-    "@tailwindcss/postcss": "4.1.15",
+    "@tailwindcss/postcss": "4.1.16",
     "@types/mdx": "2.0.13",
     "@types/node": "24.9.1",
     "@types/react": "19.2.2",
     "@types/react-dom": "19.2.2",
     "babel-plugin-react-compiler": "19.1.0-rc.3",
     "postcss": "8.5.6",
-    "tailwindcss": "4.1.15",
+    "tailwindcss": "4.1.16",
     "typescript": "5.9.3",
     "eslint": "9.38.0",
     "eslint-config-next": "15.5.6",