fix(scenarios): add error handling for API calls and dev script with local API

- add catch handler to promises for better error visibility
- use null coalescing operators to prevent undefined accessing
- add dev:compose-api npm script pointing to localhost:13000 API
- include toast dependency in useCallback to avoid stale closures

client/package.json

@@ -4,6 +4,7 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
+    "dev:compose-api": "VITE_API_URL=http://localhost:13000/api/v1 vite",
     "build": "tsc -b && vite build",
     "preview": "vite preview",
     "storybook": "storybook dev -p 6006",