fix(app): stop composer flickering during keyboard changes

Keep layout-only styles on stable React Native style IDs when they share Reanimated hosts with keyboard transforms. This prevents style regeneration from disturbing the animated native views while preserving keyboard and safe-area behavior.

packages/app/src/screens/new-workspace-screen.tsx

@@ -2,7 +2,7 @@ import { useCallback, useEffect, useMemo, useReducer, useRef, useState } from "r
 import type { ReactElement, RefObject } from "react";
 import { useTranslation } from "react-i18next";
 import type { TFunction } from "i18next";
-import { Pressable, Text, View } from "react-native";
+import { Pressable, StyleSheet as RNStyleSheet, Text, View } from "react-native";
 import type { PressableStateCallbackType } from "react-native";
 import ReanimatedAnimated from "react-native-reanimated";
 import { StyleSheet, useUnistyles, withUnistyles } from "react-native-unistyles";
@@ -2034,7 +2034,7 @@ export function NewWorkspaceScreen({
   });
 
   const centeredStyle = useMemo(
-    () => [styles.centered, composerKeyboardStyle],
+    () => [animatedStaticStyles.centered, composerKeyboardStyle],
     [composerKeyboardStyle],
   );
 
@@ -2163,6 +2163,13 @@ export function NewWorkspaceScreen({
   );
 }
 
+const animatedStaticStyles = RNStyleSheet.create({
+  centered: {
+    width: "100%",
+    maxWidth: MAX_CONTENT_WIDTH,
+  },
+});
+
 const styles = StyleSheet.create((theme) => ({
   container: {
     flex: 1,
@@ -2181,10 +2188,6 @@ const styles = StyleSheet.create((theme) => ({
   contentCompact: {
     justifyContent: "flex-end",
   },
-  centered: {
-    width: "100%",
-    maxWidth: MAX_CONTENT_WIDTH,
-  },
   composerTitleContainer: {
     marginBottom: theme.spacing[8],
     paddingLeft: theme.spacing[6],