chore(deps): update dependency @tailwindcss/postcss to v4.1.18 (#74)

This PR contains the following updates:

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

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### Release Notes

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

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

[Compare Source](tailwindlabs/tailwindcss@v4.1.17...v4.1.18)

##### Fixed

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

</details>

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Reviewed-on: https://git.csmpro.ru/csmpro/mapban/pulls/74
Co-authored-by: Renovate Bot <renovate@csmpro.ru>
Co-committed-by: Renovate Bot <renovate@csmpro.ru>

Author: Renovate Bot

apps/frontend/package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "@eslint/config-array": "0.23.0",
     "@eslint/object-schema": "3.0.0",
-    "@tailwindcss/postcss": "4.1.17",
+    "@tailwindcss/postcss": "4.1.18",
     "@types/node": "24.10.1",
     "@types/react": "19.2.7",
     "@types/react-dom": "19.2.3",