improver error handling

frontend/src/api/apiClient.ts

@@ -17,6 +17,22 @@ export const api = axios.create({
   timeout: 10000,
 });
 
+// 🔹 Normalize FastAPI errors here
+api.interceptors.response.use(
+  (response) => response,
+  (error) => {
+    // FastAPI HTTPException format
+    const detail =
+      error?.response?.data?.detail ??
+      error?.response?.data?.message ??
+      error.message ??
+      "Unknown error";
+
+    // Always reject with a standard Error
+    return Promise.reject(new Error(detail));
+  }
+);
+
 // Queries
 export const fetchInterfaces = async (): Promise<InterfaceInfo[]> => {
   const res = await api.get<InterfaceInfo[]>("/network/interfaces");