Updates to use dynamic/responsive styles on web (#1351)

* Move most responsive queries to the hook

* Fix invalid CSS value

* Fixes to tablet render of post thread

* Fix overflow issues on web

* Fix search header on tablet

* Fix QP margin in web composer

* Fix: only apply double gutter once to flatlist (close #1368)

* Fix styles on discover feeds header

* Fix double discover links in multifeed

src/view/shell/desktop/RightNav.tsx

@@ -9,6 +9,7 @@ import {TextLink} from 'view/com/util/Link'
 import {FEEDBACK_FORM_URL, HELP_DESK_URL} from 'lib/constants'
 import {s} from 'lib/styles'
 import {useStores} from 'state/index'
+import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
 import {pluralize} from 'lib/strings/helpers'
 import {formatCount} from 'view/com/util/numeric/format'
 
@@ -17,6 +18,11 @@ export const DesktopRightNav = observer(function DesktopRightNav() {
   const pal = usePalette('default')
   const palError = usePalette('error')
 
+  const {isTablet} = useWebMediaQueries()
+  if (isTablet) {
+    return null
+  }
+
   return (
     <View style={[styles.rightNav, pal.view]}>
       {store.session.hasSession && <DesktopSearch />}