Resolve merge: keep fallback path for gallery embeds

10707 grouped 'gallery' with 'images' through ImageEmbed. On the OTA
branch, gallery should dispatch to GalleryFallbackEmbed instead so older
native builds show the update prompt. Also dedupes the duplicate gallery
branches the auto-merge left in the Embed type union and parseEmbed.

src/components/Post/Embed/index.tsx

@@ -57,8 +57,7 @@ export function Embed({embed: rawEmbed, ...rest}: EmbedProps) {
     case 'images':
     case 'gallery':
     case 'link':
-    case 'video':
-    case 'gallery': {
+    case 'video': {
       return <MediaEmbed embed={embed} {...rest} />
     }
     case 'feed':
@@ -92,8 +91,7 @@ function MediaEmbed({
   embed: TEmbed
 }) {
   switch (embed.type) {
-    case 'images':
-    case 'gallery': {
+    case 'images': {
       return (
         <ContentHider
           modui={rest.moderation?.ui('contentMedia')}

src/types/bsky/post.ts

@@ -60,10 +60,6 @@ export type Embed =
       type: 'video'
       view: $Typed<AppBskyEmbedVideo.View>
     }
-  | {
-      type: 'gallery'
-      view: $Typed<AppBskyEmbedGallery.View>
-    }
   | {
       type: 'post_with_media'
       view: Embed
@@ -154,11 +150,6 @@ export function parseEmbed(embed: AppBskyFeedDefs.PostView['embed']): Embed {
       view: parseEmbedRecordView(embed.record),
       media: parseEmbed(embed.media),
     }
-  } else if (AppBskyEmbedGallery.isView(embed)) {
-    return {
-      type: 'gallery',
-      view: embed,
-    }
   } else {
     return {
       type: 'unknown',