chore(deps): bump i18next from 25.10.5 to 26.0.1 in /frontend

Bumps [i18next](https://github.com/i18next/i18next) from 25.10.5 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/v25.10.5...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>

frontend/package.json

@@ -22,7 +22,7 @@
     "axios": "^1.13.6",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
-    "i18next": "^25.10.5",
+    "i18next": "^26.0.1",
     "i18next-browser-languagedetector": "^8.2.1",
     "i18next-resources-to-backend": "^1.2.1",
     "input-otp": "^1.4.2",