Refactor feed header components (#2964)

* Move home-related files to view/com/home

* Add HomeHeader in front of FeedTabBar

* Move isDekstop check outside FeedsTabBar

* Remove PWI logic from tabbar

* Separate platform-specific layout from shared logic

src/view/com/home/HomeHeaderLayout.web.tsx

@@ -0,0 +1,50 @@
+import React from 'react'
+import {StyleSheet} from 'react-native'
+import Animated from 'react-native-reanimated'
+import {usePalette} from 'lib/hooks/usePalette'
+import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
+import {HomeHeaderLayoutMobile} from './HomeHeaderLayoutMobile'
+import {useMinimalShellMode} from 'lib/hooks/useMinimalShellMode'
+import {useShellLayout} from '#/state/shell/shell-layout'
+
+export function HomeHeaderLayout({children}: {children: React.ReactNode}) {
+  const {isMobile} = useWebMediaQueries()
+  if (isMobile) {
+    return <HomeHeaderLayoutMobile>{children}</HomeHeaderLayoutMobile>
+  } else {
+    return <HomeHeaderLayoutTablet>{children}</HomeHeaderLayoutTablet>
+  }
+}
+
+function HomeHeaderLayoutTablet({children}: {children: React.ReactNode}) {
+  const pal = usePalette('default')
+  const {headerMinimalShellTransform} = useMinimalShellMode()
+  const {headerHeight} = useShellLayout()
+
+  return (
+    // @ts-ignore the type signature for transform wrong here, translateX and translateY need to be in separate objects -prf
+    <Animated.View
+      style={[pal.view, pal.border, styles.tabBar, headerMinimalShellTransform]}
+      onLayout={e => {
+        headerHeight.value = e.nativeEvent.layout.height
+      }}>
+      {children}
+    </Animated.View>
+  )
+}
+
+const styles = StyleSheet.create({
+  tabBar: {
+    // @ts-ignore Web only
+    position: 'sticky',
+    zIndex: 1,
+    // @ts-ignore Web only -prf
+    left: 'calc(50% - 300px)',
+    width: 600,
+    top: 0,
+    flexDirection: 'row',
+    alignItems: 'center',
+    borderLeftWidth: 1,
+    borderRightWidth: 1,
+  },
+})