fix(mobile): keep the long-press actions sheet on reasoning rows for Android

mobile/src/session/MobileNativeChatLongPressContent.tsx

@@ -0,0 +1,22 @@
+import type { ComponentProps, ReactNode } from 'react'
+import { Pressable, View } from 'react-native'
+
+/** A message body that opens the actions sheet on long press (Android, which has no inline
+ *  selection). Keep the existing responder hierarchy on platforms with inline selection. */
+export function MobileNativeChatLongPressContent({
+  onLongPress,
+  style,
+  children
+}: {
+  onLongPress?: () => void
+  style: ComponentProps<typeof View>['style']
+  children: ReactNode
+}): React.JSX.Element {
+  return onLongPress ? (
+    <Pressable onLongPress={onLongPress} style={style}>
+      {children}
+    </Pressable>
+  ) : (
+    <View style={style}>{children}</View>
+  )
+}

mobile/src/session/MobileNativeChatMessage.android.test.ts

@@ -32,6 +32,7 @@ vi.mock('react-native', async () => {
 vi.mock('expo-clipboard', () => ({ setStringAsync: vi.fn() }))
 vi.mock('lucide-react-native', () => ({
   ArrowUp: 'ArrowUp',
+  Brain: 'Brain',
   ChevronDown: 'ChevronDown',
   Copy: 'Copy',
   SquareChevronRight: 'SquareChevronRight',
@@ -106,6 +107,36 @@ describe('MobileNativeChatMessage on Android', () => {
     expect(byType('MessageActionsSheet')).toHaveLength(1)
   })
 
+  it('opens the actions sheet from a long press on an expanded reasoning row, not on its headline', () => {
+    const reasoning: NativeChatMessage = {
+      ...message,
+      id: 'r1',
+      role: 'reasoning',
+      blocks: [{ type: 'text', text: 'Weighing two approaches' }],
+      timestamp: 1_000,
+      state: 'completed',
+      completedAt: 4_000
+    }
+    act(() => {
+      renderer = create(createElement(MobileNativeChatMessage, { message: reasoning }))
+    })
+    const [toggle] = byType('Pressable')
+    // A long press on the headline stays a plain toggle tap.
+    expect(toggle!.props.onLongPress).toBeUndefined()
+    act(() => toggle!.props.onPress())
+
+    const body = byType('Pressable').find((node) => node.props.onLongPress !== undefined)
+    expect(typeof body?.props.onLongPress).toBe('function')
+    const [markdown] = byType('MobileMarkdown')
+    expect(markdown!.props.onLongPress).toBe(body!.props.onLongPress)
+
+    act(() => body!.props.onLongPress())
+    const [sheet] = byType('MessageActionsSheet')
+    expect(sheet!.props.message).toBe(reasoning)
+    act(() => sheet!.props.onClose())
+    expect(byType('MessageActionsSheet')).toHaveLength(0)
+  })
+
   it('renders the user bubble without inline selection', () => {
     act(() => {
       renderer = create(

mobile/src/session/MobileNativeChatMessage.tsx

@@ -1,8 +1,9 @@
 import { MobileSelectableText as Text } from '../components/MobileSelectableText'
-import { memo, useCallback, useState, type ComponentProps, type ReactNode } from 'react'
-import { Image, Text as NativeText, Pressable, View } from 'react-native'
+import { memo, useCallback, useState } from 'react'
+import { Image, Text as NativeText, View } from 'react-native'
 import { INLINE_TEXT_SELECTION } from '../components/inline-text-selection'
 import { MobileNativeChatMessageActionsSheet } from './MobileNativeChatMessageActionsSheet'
+import { MobileNativeChatLongPressContent as Content } from './MobileNativeChatLongPressContent'
 import { splitNativeChatBlocks } from '../../../src/shared/native-chat-tool-fold'
 import { selectActiveToolCall } from '../../../src/shared/native-chat-tool-activity'
 import { isImageRefBlock, isTextBlock } from '../../../src/shared/native-chat-types'
@@ -90,25 +91,6 @@ function Prose({
   return null
 }
 
-// Keep the existing responder hierarchy on platforms with inline selection.
-function Content({
-  onLongPress,
-  style,
-  children
-}: {
-  onLongPress?: () => void
-  style: ComponentProps<typeof View>['style']
-  children: ReactNode
-}): React.JSX.Element {
-  return onLongPress ? (
-    <Pressable onLongPress={onLongPress} style={style}>
-      {children}
-    </Pressable>
-  ) : (
-    <View style={style}>{children}</View>
-  )
-}
-
 function MobileNativeChatMessageImpl({
   message,
   toolsExpanded = false,
@@ -193,9 +175,16 @@ function MobileNativeChatMessageImpl({
               markdown={markdown}
               fontScale={fontScale}
               onOpenFile={onOpenFile}
+              onLongPress={onLongPress}
             />
           </View>
         ) : null}
+        {actionsOpen ? (
+          <MobileNativeChatMessageActionsSheet
+            message={message}
+            onClose={() => setActionsOpen(false)}
+          />
+        ) : null}
         {turnStatusAbove ? null : statusRow}
       </>
     )

mobile/src/session/MobileNativeChatReasoningRow.tsx

@@ -8,6 +8,7 @@ import {
 import type { NativeChatMessage } from '../../../src/shared/native-chat-types'
 import { MobileMarkdown } from '../components/MobileMarkdown'
 import { colors } from '../theme/mobile-theme'
+import { MobileNativeChatLongPressContent } from './MobileNativeChatLongPressContent'
 import { styles } from './mobile-native-chat-message-styles'
 
 /** A reasoning row, collapsed to its headline; its text mounts only once opened. Desktop parity:
@@ -16,12 +17,15 @@ export function MobileNativeChatReasoningRow({
   message,
   markdown,
   fontScale,
-  onOpenFile
+  onOpenFile,
+  onLongPress
 }: {
   message: Pick<NativeChatMessage, 'state' | 'completedAt' | 'timestamp'>
   markdown: string
   fontScale: number
   onOpenFile?: (relativePath: string) => void
+  /** Android only: opens the message's actions sheet, as a long press on any other message does. */
+  onLongPress?: () => void
 }): React.JSX.Element {
   const [expanded, setExpanded] = useState(false)
   const headline = nativeChatReasoningHeadlineText(nativeChatReasoningHeadline(message))
@@ -46,14 +50,15 @@ export function MobileNativeChatReasoningRow({
         </View>
       </Pressable>
       {expanded ? (
-        <View style={styles.reasoning}>
+        <MobileNativeChatLongPressContent onLongPress={onLongPress} style={styles.reasoning}>
           <MobileMarkdown
             content={markdown}
             rangeSelectable
             textScale={1.25 * fontScale}
             onOpenFile={onOpenFile}
+            onLongPress={onLongPress}
           />
-        </View>
+        </MobileNativeChatLongPressContent>
       ) : null}
     </View>
   )