Setting page

* Switched to eslint.config.ts and demoted @typescript-eslint/no-unused-vars to warning
* Created /settings route, associated component and modified tests for routes
* Added tests for SettingsView.vue
* Added jiti library needed for linting
* Refactored routes' tests.
* Refactoring to reduce code duplication

package.json

@@ -38,6 +38,7 @@
     "eslint-plugin-vue": "^10.5.1",
     "globals": "^16.4.0",
     "happy-dom": "^20.0.5",
+    "jiti": "^2.6.1",
     "npm-run-all2": "^8.0.4",
     "prettier": "3.6.2",
     "resize-observer-polyfill": "^1.5.1",