fix(mobile): prevent Android transcript clipping crash

apps/mobile/src/components/agents/session-message-list.mounted.test.tsx

@@ -0,0 +1,68 @@
+/* eslint-disable typescript-eslint/no-deprecated -- react-test-renderer mounts the React Native tree without a device */
+import { createElement } from 'react';
+import TestRenderer, { act } from 'react-test-renderer';
+import { describe, expect, it, vi } from 'vitest';
+
+import { SessionMessageList } from './session-message-list';
+
+const flashListProps = vi.hoisted(() => ({ current: null as Record<string, unknown> | null }));
+
+vi.mock('@shopify/flash-list', () => ({
+  FlashList: (props: Record<string, unknown>) => {
+    flashListProps.current = props;
+    return null;
+  },
+}));
+vi.mock('react-native', () => ({
+  AccessibilityInfo: { announceForAccessibility: vi.fn() },
+  Pressable: 'Pressable',
+  View: 'View',
+}));
+vi.mock('react-native-reanimated', () => ({
+  default: { View: 'AnimatedView' },
+  FadeIn: { duration: () => ({}) },
+  FadeOut: { duration: () => ({}) },
+}));
+vi.mock('@/components/ui/icons', () => ({ ChevronDown: 'ChevronDown' }));
+vi.mock('@/lib/hooks/use-theme-colors', () => ({
+  useThemeColors: () => ({ foreground: 'black' }),
+}));
+vi.mock('@/components/agents/use-session-list-auto-scroll', () => ({
+  useSessionListAutoScroll: () => ({
+    isAtBottom: true,
+    listRef: { current: null },
+    scrollToLatestAnimated: vi.fn(),
+    handleContentSizeChange: vi.fn(),
+    handleListLayout: vi.fn(),
+    handleScroll: vi.fn(),
+    handleScrollBeginDrag: vi.fn(),
+    handleScrollEndDrag: vi.fn(),
+    handleMomentumScrollBegin: vi.fn(),
+    handleMomentumScrollEnd: vi.fn(),
+  }),
+}));
+vi.mock('@/components/agents/session-pagination-header', () => ({
+  SessionPaginationHeader: () => null,
+}));
+
+describe('SessionMessageList', () => {
+  it('disables clipped subviews to avoid Android Fabric reattachment races', () => {
+    act(() => {
+      TestRenderer.create(
+        createElement(SessionMessageList<string>, {
+          sessionId: 'session-1',
+          items: ['message-1'],
+          keyExtractor: item => item,
+          hasOlderMessages: false,
+          isLoadingOlderMessages: false,
+          olderMessagesError: null,
+          olderMessagesOmittedItemCount: 0,
+          onLoadOlderMessages: () => undefined,
+          renderItem: () => null,
+        })
+      );
+    });
+
+    expect(flashListProps.current?.removeClippedSubviews).toBe(false);
+  });
+});

apps/mobile/src/components/agents/session-message-list.tsx

@@ -189,6 +189,8 @@ export function SessionMessageList<T>({
         data={items}
         keyExtractor={keyExtractor}
         renderItem={renderItem}
+        // Android Fabric can race clipped-view reattachment with rapid transcript updates.
+        removeClippedSubviews={false}
         onScroll={handleScroll}
         onScrollBeginDrag={handleScrollBeginDrag}
         onScrollEndDrag={handleScrollEndDrag}