Add fulltext search for posts and profiles (closes #340) (#342)

* Refactor mobile search screen

* Remove 'staleness' fetch trigger on search

* Implement a temporary fulltext search solution

* Add missing key from profile search result

* A few UI & UX improvements to the search suggestions

* Update web search suggestions

* Implement search in web build

src/lib/api/search.ts

@@ -0,0 +1,69 @@
+/**
+ * This is a temporary off-spec search endpoint
+ * TODO removeme when we land this in proto!
+ */
+import {AppBskyFeedPost} from '@atproto/api'
+
+const PROFILES_ENDPOINT = 'https://search.bsky.social/search/profiles'
+const POSTS_ENDPOINT = 'https://search.bsky.social/search/posts'
+
+export interface ProfileSearchItem {
+  $type: string
+  avatar: {
+    cid: string
+    mimeType: string
+  }
+  banner: {
+    cid: string
+    mimeType: string
+  }
+  description: string | undefined
+  displayName: string | undefined
+  did: string
+}
+
+export interface PostSearchItem {
+  tid: string
+  cid: string
+  user: {
+    did: string
+    handle: string
+  }
+  post: AppBskyFeedPost.Record
+}
+
+export async function searchProfiles(
+  query: string,
+): Promise<ProfileSearchItem[]> {
+  return await doFetch<ProfileSearchItem[]>(PROFILES_ENDPOINT, query)
+}
+
+export async function searchPosts(query: string): Promise<PostSearchItem[]> {
+  return await doFetch<PostSearchItem[]>(POSTS_ENDPOINT, query)
+}
+
+async function doFetch<T>(endpoint: string, query: string): Promise<T> {
+  const controller = new AbortController()
+  const to = setTimeout(() => controller.abort(), 15e3)
+
+  const uri = new URL(endpoint)
+  uri.searchParams.set('q', query)
+
+  const res = await fetch(String(uri), {
+    method: 'get',
+    headers: {
+      accept: 'application/json',
+    },
+    signal: controller.signal,
+  })
+
+  const resHeaders: Record<string, string> = {}
+  res.headers.forEach((value: string, key: string) => {
+    resHeaders[key] = value
+  })
+  let resBody = await res.json()
+
+  clearTimeout(to)
+
+  return resBody as unknown as T
+}