Update web build and web-specific components; RNW now builds

src/view/com/util/BlurView.tsx

@@ -0,0 +1 @@
+export {BlurView} from '@react-native-community/blur'

src/view/com/util/BlurView.web.tsx

@@ -0,0 +1,4 @@
+import {View} from 'react-native'
+
+// TODO can actually support this, see https://github.com/Kureev/react-native-blur/issues/417
+export const BlurBiew = View