Improvements to UI in web logged-out views (#1341)

* Add LoggedOutLayout for desktop/tablet web

* Avoid screen flash in the transition to onboarding

* Fix comment

src/view/com/util/layouts/LoggedOutLayout.tsx

@@ -0,0 +1,102 @@
+import React from 'react'
+import {StyleSheet, View} from 'react-native'
+import {Text} from '../text/Text'
+import {usePalette} from 'lib/hooks/usePalette'
+import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
+import {useColorSchemeStyle} from 'lib/hooks/useColorSchemeStyle'
+
+export const LoggedOutLayout = ({
+  leadin,
+  title,
+  description,
+  children,
+}: React.PropsWithChildren<{
+  leadin: string
+  title: string
+  description: string
+}>) => {
+  const {isMobile, isTabletOrMobile} = useWebMediaQueries()
+  const pal = usePalette('default')
+  const sideBg = useColorSchemeStyle(pal.viewLight, pal.view)
+  const contentBg = useColorSchemeStyle(pal.view, {
+    backgroundColor: pal.colors.background,
+    borderColor: pal.colors.border,
+    borderLeftWidth: 1,
+  })
+
+  if (isMobile) {
+    return <View style={{paddingTop: 10}}>{children}</View>
+  }
+  return (
+    <View style={styles.container}>
+      <View style={[styles.side, sideBg]}>
+        <Text
+          style={[
+            pal.textLight,
+            styles.leadinText,
+            isTabletOrMobile && styles.leadinTextSmall,
+          ]}>
+          {leadin}
+        </Text>
+        <Text
+          style={[
+            pal.link,
+            styles.titleText,
+            isTabletOrMobile && styles.titleTextSmall,
+          ]}>
+          {title}
+        </Text>
+        <Text type="2xl-medium" style={[pal.textLight, styles.descriptionText]}>
+          {description}
+        </Text>
+      </View>
+      <View style={[styles.content, contentBg]}>
+        <View style={styles.contentWrapper}>{children}</View>
+      </View>
+    </View>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flexDirection: 'row',
+    height: '100vh',
+  },
+  side: {
+    flex: 1,
+    paddingHorizontal: 40,
+    paddingBottom: 80,
+    justifyContent: 'center',
+  },
+  content: {
+    flex: 2,
+    paddingHorizontal: 40,
+    justifyContent: 'center',
+  },
+
+  leadinText: {
+    fontSize: 36,
+    fontWeight: '800',
+    textAlign: 'right',
+  },
+  leadinTextSmall: {
+    fontSize: 24,
+  },
+  titleText: {
+    fontSize: 58,
+    fontWeight: '800',
+    textAlign: 'right',
+  },
+  titleTextSmall: {
+    fontSize: 36,
+  },
+  descriptionText: {
+    maxWidth: 400,
+    marginTop: 10,
+    marginLeft: 'auto',
+    textAlign: 'right',
+  },
+  contentWrapper: {
+    maxWidth: 600,
+  },
+})