Add feed tuner to remove muted threads (#8773)

src/lib/api/feed-manip.ts

···
   isIncompleteThread: boolean
   isFallbackMarker: boolean
   isOrphan: boolean
+  isThreadMuted: boolean
   rootUri: string
   feedPostUri: string
 
···
     this.isIncompleteThread = false
     this.isFallbackMarker = false
     this.isOrphan = false
+    this.isThreadMuted = post.viewer?.threadMuted ?? false
     this.feedPostUri = post.uri
     if (AppBskyFeedDefs.isPostView(reply?.root)) {
       this.rootUri = reply.root.uri
···
   ) {
     for (let i = 0; i < slices.length; i++) {
       if (slices[i].isOrphan) {
+        slices.splice(i, 1)
+        i--
+      }
+    }
+    return slices
+  }
+
+  static removeMutedThreads(
+    tuner: FeedTuner,
+    slices: FeedViewPostsSlice[],
+    _dryRun: boolean,
+  ) {
+    for (let i = 0; i < slices.length; i++) {
+      if (slices[i].isThreadMuted) {
         slices.splice(i, 1)
         i--
       }

src/state/preferences/feed-tuners.tsx

···
 import {useMemo} from 'react'
 
 import {FeedTuner} from '#/lib/api/feed-manip'
-import {FeedDescriptor} from '../queries/post-feed'
+import {type FeedDescriptor} from '../queries/post-feed'
 import {usePreferencesQuery} from '../queries/preferences'
 import {useSession} from '../session'
 import {useLanguagePrefs} from './languages'
···
       }
     }
     if (feedDesc.startsWith('feedgen')) {
-      return [FeedTuner.preferredLangOnly(langPrefs.contentLanguages)]
+      return [
+        FeedTuner.preferredLangOnly(langPrefs.contentLanguages),
+        FeedTuner.removeMutedThreads,
+      ]
     }
     if (feedDesc === 'following' || feedDesc.startsWith('list')) {
       const feedTuners = [FeedTuner.removeOrphans]
···
         feedTuners.push(FeedTuner.removeQuotePosts)
       }
       feedTuners.push(FeedTuner.dedupThreads)
+      feedTuners.push(FeedTuner.removeMutedThreads)
 
       return feedTuners
     }