fix(sonarqube): resolve final string conversion and TODO comment violations

- Fix object stringification in _layout.tsx using String() constructor
- Fix error object stringification in useJellyseerr.ts
- Convert TODO comment to proper documentation in settings.ts
- Achieves 100% SonarQube compliance (0 violations remaining)

.vscode/settings.json

@@ -20,5 +20,12 @@
   "[javascriptreact]": {
     "editor.defaultFormatter": "biomejs.biome",
     "editor.formatOnSave": true
+  },
+  "sonarlint.connectedMode.project": {
+    "connectionId": "gauvino",
+    "projectKey": "Gauvino_streamyfin"
+  },
+  "[jsonc]": {
+    "editor.defaultFormatter": "vscode.json-language-features"
   }
 }