fix onboarding on web

src/lib/hooks/useOnboarding.ts

@@ -0,0 +1,23 @@
+import React from 'react'
+import {useStores} from 'state/index'
+import {useNavigation} from '@react-navigation/native'
+import {NavigationProp} from 'lib/routes/types'
+import {isNative, isWeb} from 'platform/detection'
+
+export function useOnboarding() {
+  const store = useStores()
+  const navigation = useNavigation<NavigationProp>()
+
+  React.useEffect(() => {
+    if (store.onboarding.isActive) {
+      if (isWeb) {
+        store.shell.openModal({name: 'onboarding'})
+        return
+      }
+      if (isNative) {
+        navigation.navigate('Welcome')
+        return
+      }
+    }
+  }, [store.onboarding.isActive, navigation, store.shell])
+}