Standardise frontend hook fetch error handling and mark Task 12 done

frontend/src/hooks/useConfigActiveStatus.ts

@@ -13,6 +13,7 @@
 import { useCallback, useEffect, useRef, useState } from "react";
 import { fetchJails } from "../api/jails";
 import { fetchJailConfigs } from "../api/config";
+import { handleFetchError } from "../utils/fetchError";
 import type { JailConfig } from "../types/config";
 import type { JailSummary } from "../types/jail";
 
@@ -110,7 +111,7 @@ export function useConfigActiveStatus(): UseConfigActiveStatusResult {
       })
       .catch((err: unknown) => {
         if (ctrl.signal.aborted) return;
-        setError(err instanceof Error ? err.message : "Failed to load status.");
+        handleFetchError(err, setError, "Failed to load active status.");
         setLoading(false);
       });
   }, []);