build(deps): bump i18next from 25.10.4 to 26.0.1 in /frontend

Bumps [i18next](https://github.com/i18next/i18next) from 25.10.4 to 26.0.1.
- [Release notes](https://github.com/i18next/i18next/releases)
- [Changelog](https://github.com/i18next/i18next/blob/master/CHANGELOG.md)
- [Commits](https://github.com/i18next/i18next/compare/v25.10.4...v26.0.1)

---
updated-dependencies:
- dependency-name: i18next
  dependency-version: 26.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Daniel Volz <mail@danielvolz.org>

frontend/package.json

@@ -27,7 +27,7 @@
     "test:e2e:report": "playwright show-report"
   },
   "dependencies": {
-    "i18next": "^25.10.4",
+    "i18next": "^26.0.1",
     "i18next-browser-languagedetector": "^8.2.1",
     "lucide-react": "^1.7.0",
     "react": "^19.2.4",