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/view/com/search/SearchResults.tsx

@@ -0,0 +1,110 @@
+import React from 'react'
+import {StyleSheet, View} from 'react-native'
+import {observer} from 'mobx-react-lite'
+import {SearchUIModel} from 'state/models/ui/search'
+import {CenteredView, ScrollView} from '../util/Views'
+import {Pager, RenderTabBarFnProps} from 'view/com/util/pager/Pager'
+import {TabBar} from 'view/com/util/TabBar'
+import {Post} from 'view/com/post/Post'
+import {ProfileCardWithFollowBtn} from 'view/com/profile/ProfileCard'
+import {
+  PostFeedLoadingPlaceholder,
+  ProfileCardFeedLoadingPlaceholder,
+} from 'view/com/util/LoadingPlaceholder'
+import {Text} from 'view/com/util/text/Text'
+import {usePalette} from 'lib/hooks/usePalette'
+import {s} from 'lib/styles'
+
+const SECTIONS = ['Posts', 'Users']
+
+export const SearchResults = observer(({model}: {model: SearchUIModel}) => {
+  const pal = usePalette('default')
+
+  const renderTabBar = React.useCallback(
+    (props: RenderTabBarFnProps) => {
+      return (
+        <CenteredView style={[pal.border, styles.tabBar]}>
+          <TabBar {...props} items={SECTIONS} />
+        </CenteredView>
+      )
+    },
+    [pal],
+  )
+
+  return (
+    <Pager renderTabBar={renderTabBar} tabBarPosition="top" initialPage={0}>
+      <PostResults key="0" model={model} />
+      <Profiles key="1" model={model} />
+    </Pager>
+  )
+})
+
+const PostResults = observer(({model}: {model: SearchUIModel}) => {
+  const pal = usePalette('default')
+  if (model.isPostsLoading) {
+    return <PostFeedLoadingPlaceholder />
+  }
+
+  if (model.postUris.length === 0) {
+    return (
+      <Text type="xl" style={[styles.empty, pal.text]}>
+        No posts found for "{model.query}"
+      </Text>
+    )
+  }
+
+  return (
+    <ScrollView style={pal.view}>
+      {model.postUris.map(uri => (
+        <Post key={uri} uri={uri} hideError />
+      ))}
+      <View style={s.footerSpacer} />
+      <View style={s.footerSpacer} />
+      <View style={s.footerSpacer} />
+    </ScrollView>
+  )
+})
+
+const Profiles = observer(({model}: {model: SearchUIModel}) => {
+  const pal = usePalette('default')
+  if (model.isProfilesLoading) {
+    return <ProfileCardFeedLoadingPlaceholder />
+  }
+
+  if (model.profiles.length === 0) {
+    return (
+      <Text type="xl" style={[styles.empty, pal.text]}>
+        No users found for "{model.query}"
+      </Text>
+    )
+  }
+
+  return (
+    <ScrollView style={pal.view}>
+      {model.profiles.map(item => (
+        <ProfileCardWithFollowBtn
+          key={item.did}
+          did={item.did}
+          declarationCid={item.declaration.cid}
+          handle={item.handle}
+          displayName={item.displayName}
+          avatar={item.avatar}
+          description={item.description}
+        />
+      ))}
+      <View style={s.footerSpacer} />
+      <View style={s.footerSpacer} />
+      <View style={s.footerSpacer} />
+    </ScrollView>
+  )
+})
+
+const styles = StyleSheet.create({
+  tabBar: {
+    borderBottomWidth: 1,
+  },
+  empty: {
+    paddingHorizontal: 14,
+    paddingVertical: 16,
+  },
+})