feat: enhance editor uploads (#895)

* * multi-file paste support
* allow media files (image/videos) to be attachments
* insert trailing node if file placeholder is at the end of the editor

* fix video align

apps/client/src/features/editor/components/video/video-view.tsx

@@ -22,6 +22,7 @@ export default function VideoView(props: NodeViewProps) {
         controls
         src={getFileUrl(src)}
         className={clsx(selected ? "ProseMirror-selectednode" : "", alignClass)}
+        style={{ display: "block" }}
       />
     </NodeViewWrapper>
   );