build(deps): bump @radix-ui/react-separator in /frontend

Bumps [@radix-ui/react-separator](https://github.com/radix-ui/primitives) from 1.1.7 to 1.1.8.
- [Changelog](https://github.com/radix-ui/primitives/blob/main/release-process.md)
- [Commits](https://github.com/radix-ui/primitives/commits)

---
updated-dependencies:
- dependency-name: "@radix-ui/react-separator"
  dependency-version: 1.1.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/package.json

@@ -16,7 +16,7 @@
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
     "@radix-ui/react-select": "^2.2.6",
-    "@radix-ui/react-separator": "^1.1.7",
+    "@radix-ui/react-separator": "^1.1.8",
     "@radix-ui/react-slot": "^1.2.4",
     "@radix-ui/react-tabs": "^1.1.13",
     "@tailwindcss/vite": "^4.1.16",