fix(app): synchronize chat submission and keyboard state

Render optimistic turn feedback before host acknowledgement and roll it back on rejection. Reconcile iOS keyboard offsets from the native transition end event so JS contention cannot leave the composer displaced.

packages/app/src/hooks/use-keyboard-shift-style.ts

@@ -9,7 +9,10 @@ import {
 import { Platform } from "react-native";
 import type { ViewStyle } from "react-native";
 import { useSafeAreaInsets } from "react-native-safe-area-context";
-import { useReanimatedKeyboardAnimation } from "react-native-keyboard-controller";
+import {
+  useGenericKeyboardHandler,
+  useReanimatedKeyboardAnimation,
+} from "react-native-keyboard-controller";
 import {
   useAnimatedStyle,
   useDerivedValue,
@@ -40,6 +43,19 @@ export function KeyboardShiftProvider({ children }: { children: ReactNode }) {
     bottomInset.value = insets.bottom;
   }, [bottomInset, insets.bottom]);
 
+  useGenericKeyboardHandler(
+    {
+      onEnd: (event) => {
+        "worklet";
+        if (isIos) {
+          keyboardHeight.value = -event.height;
+          keyboardProgress.value = event.progress;
+        }
+      },
+    },
+    [isIos, keyboardHeight, keyboardProgress],
+  );
+
   const shift = useDerivedValue(() => {
     "worklet";
     return resolveKeyboardShift({