chore: clean git cache

frontend/src/api/client.ts

@@ -0,0 +1,36 @@
+import axios from 'axios';
+
+/**
+ * Pre-configured Axios instance for API communication.
+ * Includes base URL, credentials, and timeout settings.
+ */
+const client = axios.create({
+  baseURL: '/api/v1',
+  withCredentials: true, // Required for HttpOnly cookie transmission
+  timeout: 30000, // 30 second timeout
+});
+
+/**
+ * Sets or clears the Authorization header for API requests.
+ * @param token - JWT token to set, or null to clear authentication
+ */
+export const setAuthToken = (token: string | null) => {
+  if (token) {
+    client.defaults.headers.common.Authorization = `Bearer ${token}`;
+  } else {
+    delete client.defaults.headers.common.Authorization;
+  }
+};
+
+// Global 401 error logging for debugging
+client.interceptors.response.use(
+  (response) => response,
+  (error) => {
+    if (error.response?.status === 401) {
+      console.warn('Authentication failed:', error.config?.url);
+    }
+    return Promise.reject(error);
+  }
+);
+
+export default client;