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/com/pager/FeedsTabBar.web.tsx

@@ -13,8 +13,8 @@ export const FeedsTabBar = observer(
   (
     props: RenderTabBarFnProps & {testID?: string; onPressSelected: () => void},
   ) => {
-    const {isDesktop} = useWebMediaQueries()
-    if (!isDesktop) {
+    const {isMobile} = useWebMediaQueries()
+    if (isMobile) {
       return <FeedsTabBarMobile {...props} />
     } else {
       return <FeedsTabBarDesktop {...props} />