chore: break up file backups into two components

app/assets/javascripts/Utils/DragTypeCheck.tsx

@@ -0,0 +1,31 @@
+import { WebApplication } from '@/UIModels/Application'
+
+export const isHandlingFileDrag = (event: DragEvent, application: WebApplication) => {
+  const items = event.dataTransfer?.items
+
+  if (!items) {
+    return false
+  }
+
+  return Array.from(items).some((item) => {
+    const isFile = item.kind === 'file'
+    const fileName = item.getAsFile()?.name || ''
+    const isBackupMetadataFile = application.files.isFileNameFileBackupMetadataFile(fileName)
+    return isFile && !isBackupMetadataFile
+  })
+}
+
+export const isHandlingBackupDrag = (event: DragEvent, application: WebApplication) => {
+  const items = event.dataTransfer?.items
+
+  if (!items) {
+    return false
+  }
+
+  return Array.from(items).every((item) => {
+    const isFile = item.kind === 'file'
+    const fileName = item.getAsFile()?.name || ''
+    const isBackupMetadataFile = application.files.isFileNameFileBackupMetadataFile(fileName)
+    return isFile && isBackupMetadataFile
+  })
+}