Factor our feed source model (#1887)

* Refactor first onboarding step

* Replace old FeedSourceCard

* Clean up CustomFeedEmbed

* Remove discover feeds model

* Refactor ProfileFeed screen

* Remove useCustomFeed

* Delete some unused models

* Rip out more prefs

* Factor out treeView from thread comp

* Improve last commit

src/state/queries/suggested-feeds.ts

@@ -0,0 +1,29 @@
+import {useInfiniteQuery, InfiniteData, QueryKey} from '@tanstack/react-query'
+import {AppBskyFeedGetSuggestedFeeds} from '@atproto/api'
+
+import {useSession} from '#/state/session'
+
+export const suggestedFeedsQueryKey = ['suggestedFeeds']
+
+export function useSuggestedFeedsQuery() {
+  const {agent} = useSession()
+
+  return useInfiniteQuery<
+    AppBskyFeedGetSuggestedFeeds.OutputSchema,
+    Error,
+    InfiniteData<AppBskyFeedGetSuggestedFeeds.OutputSchema>,
+    QueryKey,
+    string | undefined
+  >({
+    queryKey: suggestedFeedsQueryKey,
+    queryFn: async ({pageParam}) => {
+      const res = await agent.app.bsky.feed.getSuggestedFeeds({
+        limit: 10,
+        cursor: pageParam,
+      })
+      return res.data
+    },
+    initialPageParam: undefined,
+    getNextPageParam: lastPage => lastPage.cursor,
+  })
+}