Remove post_gallery_embed:enable feature gate

The embed type now decides the image layout everywhere: gallery embeds
render as the carousel, legacy `app.bsky.embed.images` embeds render as
the grid. This also means legacy image embeds never need the gallery
offset styles.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SvDXhHEBCjAfokEFK8pHt8

src/analytics/features/types.ts

@@ -12,7 +12,6 @@ export enum Features {
   GroupChatsDisable = 'group_chats:disable',
   ComposerLanguageDetectionEnable = 'composer:language_detection:enable',
   ComposerImageLayoutToggleEnable = 'composer:image_layout_toggle:enable',
-  PostGalleryEmbedEnable = 'post_gallery_embed:enable',
   NotificationsExpandedProfileCardEnable = 'notifications:expanded_profile_card:enable',
   SearchV2Enable = 'search_v2:enable',
   AdvancedSearchV2Enable = 'advanced_search_v2:enable',

src/components/Post/Embed/ImageEmbed.tsx

@@ -37,19 +37,17 @@ export function ImageEmbed({
         }))
       : embed.view.images
   /*
-   * The gallery embed type implies the carousel layout: >4 images always
-   * publishes as a gallery, and the composer's layout toggle experiment
-   * publishes 2-4 images as a gallery when the user opts into the carousel.
-   * Legacy `images` embeds keep the grid unless the viewer-side gate flips
-   * them to the carousel.
+   * The embed type decides the layout: gallery embeds render as the
+   * carousel (>4 images always publishes as a gallery, and the composer's
+   * layout toggle experiment lets 2-4 images opt in), legacy `images`
+   * embeds render as the grid.
    */
-  const useExpandedLayout =
-    embed.type === 'gallery'
-      ? true
-      : ax.features.enabled(ax.features.PostGalleryEmbedEnable)
-
   const layout: 'single' | 'grid' | 'carousel' =
-    images.length === 1 ? 'single' : useExpandedLayout ? 'carousel' : 'grid'
+    images.length === 1
+      ? 'single'
+      : embed.type === 'gallery'
+        ? 'carousel'
+        : 'grid'
 
   const postContext = rest.post
     ? {
@@ -153,7 +151,7 @@ export function ImageEmbed({
       )
     }
 
-    if (useExpandedLayout) {
+    if (layout === 'carousel') {
       return (
         <View style={[a.mt_sm, rest.style]}>
           <Gallery

src/components/images/Gallery/maybeApplyGalleryOffsetStyles.ts

@@ -10,7 +10,6 @@ import {
 
 import {unique} from '#/lib/moderation'
 import {type AppModerationCause} from '#/components/Pills'
-import {Features, features} from '#/analytics/features'
 import * as bsky from '#/types/bsky'
 
 export const POST_META_NO_CONTENT_OFFSET = {paddingTop: 10}
@@ -37,13 +36,6 @@ export function maybeApplyGalleryOffsetStyles(
     return
   }
 
-  // The gate only controls whether legacy image embeds opt into the new
-  // expanded gallery layout. Gallery embeds always render expanded by item
-  // count, so their offset must apply regardless of the gate.
-  const isPostGalleryEmbedEnabled = features.isOn(
-    Features.PostGalleryEmbedEnable,
-  )
-
   /*
    * First check if we even have images
    */
@@ -68,10 +60,8 @@ export function maybeApplyGalleryOffsetStyles(
     )
   let hasImages = false
   if (isImageEmbed) {
-    if (!isPostGalleryEmbedEnabled) return
-    // one image, not a gallery
-    if (embed.images.length === 1) return
-    hasImages = true
+    // legacy image embeds render as the grid, which needs no offset
+    return
   }
   if (isGalleryEmbed) {
     // single (or empty) gallery - no offset needed
@@ -85,9 +75,8 @@ export function maybeApplyGalleryOffsetStyles(
         AppBskyEmbedImages.isMain,
       )
     ) {
-      if (!isPostGalleryEmbedEnabled) return
-      // one image, not a gallery
-      if (embed.media.images.length === 1) return
+      // legacy image embeds render as the grid, which needs no offset
+      return
     }
     if (
       bsky.dangerousIsType<AppBskyEmbedGallery.Main>(

src/view/com/posts/PostFeed.tsx

@@ -968,16 +968,13 @@ let PostFeed = ({
             : post.embed.images.length
           /*
            * Keep in sync with the layout decision in ImageEmbed: gallery
-           * embeds always render as the carousel, legacy `images` embeds
-           * depend on the viewer-side gate.
+           * embeds render as the carousel, legacy `images` embeds as the
+           * grid.
            */
-          const useExpandedLayout = AppBskyEmbedGallery.isView(post.embed)
-            ? true
-            : ax.features.enabled(ax.features.PostGalleryEmbedEnable)
           const layout =
             totalImages === 1
               ? 'single'
-              : useExpandedLayout
+              : AppBskyEmbedGallery.isView(post.embed)
                 ? 'carousel'
                 : 'grid'