chore(deps-dev): bump @sveltejs/vite-plugin-svelte in /frontend

Bumps [@sveltejs/vite-plugin-svelte](https://github.com/sveltejs/vite-plugin-svelte/tree/HEAD/packages/vite-plugin-svelte) from 5.1.1 to 7.0.0.
- [Release notes](https://github.com/sveltejs/vite-plugin-svelte/releases)
- [Changelog](https://github.com/sveltejs/vite-plugin-svelte/blob/main/packages/vite-plugin-svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/vite-plugin-svelte/commits/@sveltejs/vite-plugin-svelte@7.0.0/packages/vite-plugin-svelte)

---
updated-dependencies:
- dependency-name: "@sveltejs/vite-plugin-svelte"
  dependency-version: 7.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -16,7 +16,7 @@
     "@svelte-plugins/datepicker": "^1.0.11",
     "@sveltejs/adapter-static": "^3.0.9",
     "@sveltejs/kit": "^2.53.4",
-    "@sveltejs/vite-plugin-svelte": "^5.1.1",
+    "@sveltejs/vite-plugin-svelte": "^7.0.0",
     "@tsconfig/svelte": "^5.0.8",
     "@types/node": "^25.5.2",
     "@typescript-eslint/eslint-plugin": "^8.56.1",