feat: add corresponding icons to files (#164)

web/src/utils/documentUtils.ts

@@ -38,3 +38,7 @@ export const isFileUploadDone = (file: UploadFile) => file.status === 'done';
 
 export const getExtension = (name: string) =>
   name?.slice(name.lastIndexOf('.') + 1).toLowerCase() ?? '';
+
+export const isPdf = (name: string) => {
+  return getExtension(name) === 'pdf';
+};