Add gallery embed type support (display + compose) (#10707)

src/types/bsky/post.ts

@@ -1,6 +1,7 @@
 import {
   type $Typed,
   AppBskyEmbedExternal,
+  AppBskyEmbedGallery,
   AppBskyEmbedImages,
   AppBskyEmbedRecord,
   AppBskyEmbedRecordWithMedia,
@@ -47,6 +48,10 @@ export type Embed =
       type: 'images'
       view: $Typed<AppBskyEmbedImages.View>
     }
+  | {
+      type: 'gallery'
+      view: $Typed<AppBskyEmbedGallery.View>
+    }
   | {
       type: 'link'
       view: $Typed<AppBskyEmbedExternal.View>
@@ -122,6 +127,11 @@ export function parseEmbed(embed: AppBskyFeedDefs.PostView['embed']): Embed {
       type: 'images',
       view: embed,
     }
+  } else if (AppBskyEmbedGallery.isView(embed)) {
+    return {
+      type: 'gallery',
+      view: embed,
+    }
   } else if (AppBskyEmbedExternal.isView(embed)) {
     return {
       type: 'link',