Handle malformed article URLs

package.json

@@ -5,7 +5,8 @@
   "scripts": {
     "dev": "vite",
     "build": "vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest"
   },
   "dependencies": {
     "@google/genai": "^1.30.0",
@@ -20,6 +21,7 @@
     "@types/uuid": "^10.0.0",
     "@vitejs/plugin-react": "^4.3.4",
     "typescript": "^5.7.2",
-    "vite": "^6.0.0"
+    "vite": "^6.0.0",
+    "vitest": "^4.0.14"
   }
-}
+}