feat: add file preview modal (#945)

app/assets/javascripts/components/Files/isFilePreviewable.ts

@@ -0,0 +1,12 @@
+export const isFileTypePreviewable = (fileType: string) => {
+  const isImage = fileType.startsWith('image/');
+  const isVideo = fileType.startsWith('video/');
+  const isAudio = fileType.startsWith('audio/');
+  const isPdf = fileType === 'application/pdf';
+
+  if (isImage || isVideo || isAudio || isPdf) {
+    return true;
+  }
+
+  return false;
+};