[APP-2160] Extract StandardSiteEmbed type guards into utils.ts

Move isStandardSiteEmbed alongside a new isStandardSitePublicationEmbed
helper. The publication check now requires at least one publication ref
and zero document refs, replacing a tautological condition that also
returned true for empty associatedRefs arrays.

src/components/Post/Embed/StandardSiteEmbed/index.tsx

@@ -29,6 +29,7 @@ import {Link} from '#/components/Link'
 import {MediaInsetBorder} from '#/components/MediaInsetBorder'
 import {PublicationMetaRow} from '#/components/Post/Embed/StandardSiteEmbed/PublicationMetaRow'
 import {StandardSiteThemeProvider} from '#/components/Post/Embed/StandardSiteEmbed/StandardSiteThemeProvider'
+import {isStandardSitePublicationEmbed} from '#/components/Post/Embed/StandardSiteEmbed/utils'
 import {Text} from '#/components/Typography'
 import {IS_NATIVE} from '#/env'
 
@@ -38,12 +39,6 @@ export type ThemeColors = {
   accentForeground: string
 }
 
-export function isStandardSiteEmbed(view: AppBskyEmbedExternal.ViewExternal) {
-  return view.associatedRefs?.some(ref =>
-    new AtUri(ref.uri).collection.startsWith('site.standard.'),
-  )
-}
-
 export function useStandardSitePublisherConfig(
   view: AppBskyEmbedExternal.ViewExternal,
 ) {
@@ -102,11 +97,7 @@ export const StandardSiteEmbed = ({
   const isStandard = view.associatedRefs?.some(ref =>
     new AtUri(ref.uri).collection.startsWith('site.standard.'),
   )
-  const isStandardPublication = view.associatedRefs?.every(
-    ref =>
-      new AtUri(ref.uri).collection === 'site.standard.publication' &&
-      new AtUri(ref.uri).collection !== 'site.standard.document',
-  )
+  const isStandardPublication = isStandardSitePublicationEmbed(view)
   const themeColors = useMemo(() => {
     let custom = false
     let accent = t.atoms.text.color

src/components/Post/Embed/StandardSiteEmbed/utils.ts

@@ -0,0 +1,20 @@
+import {type AppBskyEmbedExternal, AtUri} from '@atproto/api'
+
+export function isStandardSiteEmbed(view: AppBskyEmbedExternal.ViewExternal) {
+  return view.associatedRefs?.some(ref =>
+    new AtUri(ref.uri).collection.startsWith('site.standard.'),
+  )
+}
+
+export function isStandardSitePublicationEmbed(
+  view: AppBskyEmbedExternal.ViewExternal,
+) {
+  return (
+    view.associatedRefs?.some(
+      ref => new AtUri(ref.uri).collection === 'site.standard.publication',
+    ) &&
+    view.associatedRefs.every(
+      ref => new AtUri(ref.uri).collection !== 'site.standard.document',
+    )
+  )
+}

src/components/Post/Embed/index.tsx

@@ -22,10 +22,8 @@ import {useInteractionState} from '#/components/hooks/useInteractionState'
 import {GalleryBleed} from '#/components/images/Gallery'
 import {ContentHider} from '#/components/moderation/ContentHider'
 import {PostAlerts} from '#/components/moderation/PostAlerts'
-import {
-  isStandardSiteEmbed,
-  StandardSiteEmbed,
-} from '#/components/Post/Embed/StandardSiteEmbed'
+import {StandardSiteEmbed} from '#/components/Post/Embed/StandardSiteEmbed'
+import {isStandardSiteEmbed} from '#/components/Post/Embed/StandardSiteEmbed/utils'
 import {RichText} from '#/components/RichText'
 import {Embed as StarterPackCard} from '#/components/StarterPack/StarterPackCard'
 import {SubtleHover} from '#/components/SubtleHover'

src/view/com/composer/ExternalEmbed.tsx

@@ -12,10 +12,8 @@ import {Loader} from '#/components/Loader'
 import {ExternalEmbed} from '#/components/Post/Embed/ExternalEmbed'
 import {ModeratedFeedEmbed} from '#/components/Post/Embed/FeedEmbed'
 import {ModeratedListEmbed} from '#/components/Post/Embed/ListEmbed'
-import {
-  isStandardSiteEmbed,
-  StandardSiteEmbed,
-} from '#/components/Post/Embed/StandardSiteEmbed'
+import {StandardSiteEmbed} from '#/components/Post/Embed/StandardSiteEmbed'
+import {isStandardSiteEmbed} from '#/components/Post/Embed/StandardSiteEmbed/utils'
 import {Embed as StarterPackEmbed} from '#/components/StarterPack/StarterPackCard'
 import {Text} from '#/components/Typography'
 import {type Gif} from '#/features/gifPicker/types'