[FA-misc] Fix issues with novel imports

fictionarchive-web-astro/src/lib/graphql/mutations/importNovel.graphql

@@ -1,8 +1,13 @@
 mutation ImportNovel($input: ImportNovelInput!) {
   importNovel(input: $input) {
-    novelImportRequested {
+    importNovelResult {
       importId
       novelUrl
     }
+    errors {
+      ... on InvalidOperationError {
+        message
+      }
+    }
   }
 }