fix type errors

apps/app/src/client/components/InfiniteScroll.tsx

@@ -27,7 +27,7 @@ const useIntersection = <E extends HTMLElement>(): [boolean, Ref<E>] => {
     }
     return;
   }, [element]);
-  return [intersecting, el => el && setElement(el)];
+  return [intersecting, (el) => { if (el != null) setElement(el); }];
 };
 
 const LoadingIndicator = (): React.ReactElement => {

apps/app/src/client/components/PageEditor/MarkdownTableDataImportForm.tsx

@@ -57,7 +57,6 @@ export const MarkdownTableDataImportForm = (props: MarkdownTableDataImportFormPr
         <select
           id="data-import-form-type-select"
           className="form-select"
-          placeholder="select"
           value={dataFormat}
           onChange={(e) => { return setDataFormat(e.target.value) }}
         >