fix: debouncing sync and other improvements

src/api/http.ts

@@ -0,0 +1,10 @@
+export const API_BASE_URL = import.meta.env.VITE_API_BASE_URL ?? '/api/v1'
+
+export async function extractErrorMessage(response: Response, fallback: string): Promise<string> {
+  try {
+    const errorData = await response.json()
+    return errorData.message || errorData.error || fallback
+  } catch {
+    return response.statusText || fallback
+  }
+}