go back gesture, tweak header copy

src/components/StarterPack/Wizard/BackGestureDetector.ios.tsx

@@ -0,0 +1,28 @@
+import React from 'react'
+import {Gesture, GestureDetector} from 'react-native-gesture-handler'
+import {runOnJS} from 'react-native-reanimated'
+
+export function BackGestureDetector({
+  onBack,
+  children,
+}: {
+  onBack: () => void
+  children: React.ReactNode
+}) {
+  const swipeGesture = Gesture.Pan()
+    .maxPointers(1)
+    .onEnd(({translationX, translationY, velocityX}) => {
+      if (
+        // Make sure it isn't a scrollview
+        translationX > translationY &&
+        translationY <= 10 &&
+        translationX >= 25 &&
+        // Shouldn't be a really slow swipe
+        velocityX >= 300
+      ) {
+        runOnJS(onBack)()
+      }
+    })
+
+  return <GestureDetector gesture={swipeGesture}>{children}</GestureDetector>
+}

src/components/StarterPack/Wizard/BackGestureDetector.tsx

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+import React from 'react'
+
+export function BackGestureDetector({
+  onBack: _onBack,
+  children,
+}: {
+  onBack: () => void
+  children: React.ReactNode
+}) {
+  return children
+}