add reusable per-user contract signatures with profile prefill and approval

apps/edr-freight-web/backoffice/src/hooks/useSavedSignature.ts

@@ -0,0 +1,30 @@
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import toast from "react-hot-toast";
+
+import {
+  signaturesService,
+  type SaveSignaturePayload,
+} from "@/services/signatures.service";
+
+const SAVED_SIGNATURE_KEY = ["me", "signature"] as const;
+
+export function useMySignature() {
+  return useQuery({
+    queryKey: SAVED_SIGNATURE_KEY,
+    queryFn: () => signaturesService.getMySignature(),
+    staleTime: 60_000,
+  });
+}
+
+export function useSaveSignature() {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: (payload: SaveSignaturePayload) =>
+      signaturesService.saveMySignature(payload),
+    onSuccess: () => {
+      toast.success("Signature saved");
+      void qc.invalidateQueries({ queryKey: SAVED_SIGNATURE_KEY });
+    },
+    onError: () => toast.error("Failed to save signature"),
+  });
+}