feat: Add option to replace existing file attachment in editor

shared/editor/components/Styles.ts

@@ -488,6 +488,12 @@ iframe.embed {
   }
 }
 
+.attachment-replacement-uploading {
+  .widget {
+    opacity: 0.5;
+  }
+}
+
 .image-replacement-uploading {
   img {
     opacity: 0.5;

shared/editor/components/Widget.tsx

@@ -11,6 +11,7 @@ type Props = {
   isSelected: boolean;
   children?: React.ReactNode;
   onMouseDown?: React.MouseEventHandler<HTMLAnchorElement>;
+  onClick?: React.MouseEventHandler<HTMLAnchorElement>;
 };
 
 export default function Widget(props: Props & ThemeProps<DefaultTheme>) {
@@ -22,6 +23,7 @@ export default function Widget(props: Props & ThemeProps<DefaultTheme>) {
       href={sanitizeUrl(props.href)}
       rel="noreferrer nofollow"
       onMouseDown={props.onMouseDown}
+      onClick={props.onClick}
     >
       {props.icon}
       <Preview>