fix(app): iPad hardware Enter submits the composer

Fixes #810

packages/app/src/native/ios-hardware-keyboard-submit.ts

@@ -0,0 +1,34 @@
+import type { EventSubscription } from "expo-modules-core";
+
+type HardwareKeyboardSubmitHandler = () => void;
+
+const testHandlers = new Set<HardwareKeyboardSubmitHandler>();
+let isEnabledForTest = false;
+
+export function setHardwareKeyboardSubmitEnabled(enabled: boolean) {
+  isEnabledForTest = enabled;
+}
+
+export function addHardwareKeyboardSubmitListener(
+  handler: HardwareKeyboardSubmitHandler,
+): EventSubscription {
+  testHandlers.add(handler);
+  return {
+    remove: () => {
+      testHandlers.delete(handler);
+    },
+  };
+}
+
+export function emitHardwareKeyboardSubmitForTest() {
+  testHandlers.forEach((handler) => handler());
+}
+
+export function resetHardwareKeyboardSubmitForTest() {
+  testHandlers.clear();
+  isEnabledForTest = false;
+}
+
+export function getHardwareKeyboardSubmitEnabledForTest() {
+  return isEnabledForTest;
+}