[Lightbox] Add border radius to avatars (#6136)

* Preserve shape in lightbox

* Rename shapes to semantic meanings

It looks like after all I do want to fork based on those.

* Round avatars on the web

* Oops

src/view/com/util/post-embeds/index.tsx

@@ -152,7 +152,10 @@ export function PostEmbeds({
         thumbDims: MeasuredDimensions | null,
       ) => {
         openLightbox({
-          images: items,
+          images: items.map(item => ({
+            ...item,
+            type: 'image',
+          })),
           index,
           thumbDims,
         })