feat(web): adopt MutationError across create/object forms; distinguish edit-form fetch error (#63)

web/src/objects/object-new-page.tsx

@@ -4,6 +4,7 @@ import { useTranslation } from "react-i18next";
 
 import { ObjectForm, type ObjectFormValues } from "./object-form";
 import { useCreateObject, useSetFields, FieldRejection } from "../api/queries";
+import { errorMessageKey } from "../api/error-message";
 import { useDocumentTitle } from "../lib/use-document-title";
 import { useBreadcrumb } from "../shell/use-breadcrumb";
 import { PageTitle } from "@/components/ui/page-title";
@@ -33,8 +34,9 @@ export function ObjectNewPage() {
       });
 
       id = created.id;
-    } catch {
-      setError(t("form.rejected"));
+    } catch (e) {
+      const { key, opts } = errorMessageKey(e);
+      setError(t(key, opts));
       return false;
     }