[APP-1934] replace image grid layout with carousel (#10157)

Co-authored-by: RetroSunstar <57507616+RetroSunstar@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Eric Bailey <git@esb.lol>

src/analytics/features/types.ts

@@ -13,6 +13,7 @@ export enum Features {
   ImageUploadsBlobSize2mbEnabled = 'image_uploads:blob_size_2mb:enabled',
   GroupChatsEnable = 'group_chats:enable',
   DmsNewMessageComposerEnable = 'dms:new_message_composer:enable',
+  PostGalleryEmbedEnable = 'post_gallery_embed:enable',
 
   AATest = 'aa-test',
 }