fix(mobile): Fixed issue where pressing the back button on editor screen wouldn't switch back to the items list on Android

packages/web/src/javascripts/NativeMobileWeb/AndroidBackHandler.tsx

@@ -3,6 +3,11 @@ type RemoveListener = () => void
 
 export class AndroidBackHandler {
   private listeners = new Set<Listener>()
+  private fallbackListener: Listener | undefined
+
+  setFallbackListener(listener: Listener) {
+    this.fallbackListener = listener
+  }
 
   addEventListener(listener: Listener): RemoveListener {
     this.listeners.add(listener)
@@ -13,10 +18,17 @@ export class AndroidBackHandler {
   }
 
   notifyEvent() {
+    let handled = false
     for (const listener of Array.from(this.listeners).reverse()) {
       if (listener()) {
+        handled = true
         return
+      } else {
+        handled = false
       }
     }
+    if (!handled && this.fallbackListener) {
+      this.fallbackListener()
+    }
   }
 }