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/composer/draft/workspace-tab.tsx

@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useMemo, useRef } from "react";
-import { Keyboard, ScrollView, Text, View } from "react-native";
+import { Keyboard, ScrollView, StyleSheet as RNStyleSheet, Text, View } from "react-native";
 import { useTranslation } from "react-i18next";
 import ReanimatedAnimated from "react-native-reanimated";
 import { StyleSheet } from "react-native-unistyles";
@@ -665,7 +665,11 @@ export function WorkspaceDraftAgentTab({
   });
 
   const inputAreaWrapperStyle = useMemo(
-    () => [styles.inputAreaWrapper, { paddingBottom: insets.bottom }, composerKeyboardStyle],
+    () => [
+      animatedStaticStyles.inputAreaWrapper,
+      { paddingBottom: insets.bottom },
+      composerKeyboardStyle,
+    ],
     [insets.bottom, composerKeyboardStyle],
   );
 
@@ -772,6 +776,12 @@ export function WorkspaceDraftAgentTab({
   );
 }
 
+const animatedStaticStyles = RNStyleSheet.create({
+  inputAreaWrapper: {
+    width: "100%",
+  },
+});
+
 const styles = StyleSheet.create((theme) => ({
   container: {
     flex: 1,
@@ -795,10 +805,6 @@ const styles = StyleSheet.create((theme) => ({
   configSection: {
     gap: theme.spacing[3],
   },
-  inputAreaWrapper: {
-    width: "100%",
-    backgroundColor: theme.colors.surface0,
-  },
   importPillRow: {
     width: "100%",
     paddingHorizontal: theme.spacing[4],