chore: Bump stylelint in /frontend in the npm-version-updates group

Bumps the npm-version-updates group in /frontend with 1 update: [stylelint](https://github.com/stylelint/stylelint).


Updates `stylelint` from 16.26.0 to 16.26.1
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/main/CHANGELOG.md)
- [Commits](stylelint/stylelint@16.26.0...16.26.1)

---
updated-dependencies:
- dependency-name: stylelint
  dependency-version: 16.26.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm-version-updates
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package-lock.json

@@ -39,7 +39,7 @@
     "jsdom": "^26.1.0",
     "neostandard": "^0.12.2",
     "postcss-html": "^1.8.0",
-    "stylelint": "^16.26.0",
+    "stylelint": "^16.26.1",
     "stylelint-config-recommended-vue": "^1.6.1",
     "stylelint-config-standard": "^39.0.1",
     "vite": "^7.2.4",