fix(mobile): onError på 15 mutationer – inga tysta miss (MIKRO 52)

apps/mobile/src/app/scan-diff-review/[jobId].tsx

@@ -1,5 +1,5 @@
 import { useMemo, useState } from "react";
-import { View } from "react-native";
+import { Alert, View } from "react-native";
 import { router, useLocalSearchParams } from "expo-router";
 import { useMutation, useQuery } from "@tanstack/react-query";
 import { api } from "@/lib/api";
@@ -52,6 +52,8 @@ export default function ScanDiffReviewScreen() {
     onSuccess: () => {
       router.back();
     },
+    onError: (err) =>
+      Alert.alert(t("common.oops"), err instanceof Error ? err.message : t("common.error")),
   });
 
   const rows = useMemo(() => query.data?.rows ?? [], [query.data]);