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

web/src/authorities/authorities-page.tsx

@@ -5,6 +5,7 @@ import { useTranslation } from "react-i18next";
 import type { components } from "../api/schema";
 import { useAuthorities, useCreateAuthority } from "../api/queries";
 import { LabelEditor } from "../components/label-editor";
+import { MutationError } from "../components/mutation-error";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
@@ -141,11 +142,7 @@ export function AuthoritiesPage() {
           </p>
         )}
 
-        {create.isError && (
-          <p role="alert" className="text-xs text-destructive">
-            {t("form.rejected")}
-          </p>
-        )}
+        <MutationError error={create.error} />
 
         <Button type="submit" size="sm" disabled={create.isPending}>
           {t("authorities.create")}