Send Bluesky feeds and suggested follows more data (#3695)

* WIP

* Fix constructors

* Clean up

* Tweak

* Rm extra assignment

* Narrow down the argument

---------

Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

src/lib/api/feed/utils.ts

@@ -0,0 +1,21 @@
+import {AtUri} from '@atproto/api'
+
+import {BSKY_FEED_OWNER_DIDS} from '#/lib/constants'
+import {UsePreferencesQueryResponse} from '#/state/queries/preferences'
+
+export function createBskyTopicsHeader(userInterests?: string) {
+  return {
+    'X-Bsky-Topics': userInterests || '',
+  }
+}
+
+export function aggregateUserInterests(
+  preferences?: UsePreferencesQueryResponse,
+) {
+  return preferences?.interests?.tags?.join(',') || ''
+}
+
+export function isBlueskyOwnedFeed(feedUri: string) {
+  const uri = new AtUri(feedUri)
+  return BSKY_FEED_OWNER_DIDS.includes(uri.host)
+}