fix(mobile): the iPhone Duo keeps list titles through folds and unfolds with its sidebar

apps/mobile/package.json

@@ -134,7 +134,7 @@
     "react-native-pdf-jsi": "5.0.0",
     "react-native-reanimated": "4.7.1",
     "react-native-safe-area-context": "~5.10.1",
-    "react-native-screens": "file:deps/react-native-screens-5.0.0-t3.31.tgz",
+    "react-native-screens": "file:deps/react-native-screens-5.0.0-t3.32.tgz",
     "react-native-shiki-engine": "^0.3.12",
     "react-native-svg": "15.16.0",
     "react-native-webview": "14.0.1",

apps/mobile/src/features/layout/createWorkspaceStackNavigator.ios.tsx

@@ -224,7 +224,10 @@ function WorkspaceColumns(
         collapsed.current = false;
       }}
       preferredDisplayMode={
-        panes.primarySidebarVisible || (!layout.usesSplitView && !activeDetailKey)
+        // UIKit applies the mode as a collapsed split expands, before the new width reaches JS, so a
+        // collapsed split already carries the sidebar the expanded one will show.
+        (layout.usesSplitView ? panes.primarySidebarVisible : panes.primarySidebarWhenExpanded) ||
+        (!layout.usesSplitView && !activeDetailKey)
           ? "oneBesideSecondary"
           : "secondaryOnly"
       }

apps/mobile/src/lib/layout.ts

@@ -58,6 +58,8 @@ export interface Layout {
 
 export interface WorkspacePaneLayout {
   readonly primarySidebarVisible: boolean;
+  /** Whether the sidebar shows once a collapsed split expands; independent of the current width. */
+  readonly primarySidebarWhenExpanded: boolean;
   readonly primarySidebarSuppressedByAuxiliary: boolean;
   readonly contentPaneWidth: number;
   readonly supportsAuxiliaryPane: boolean;
@@ -215,6 +217,7 @@ export function deriveWorkspacePaneLayout(input: {
 
     return {
       primarySidebarVisible,
+      primarySidebarWhenExpanded: input.primarySidebarPreferredVisible,
       primarySidebarSuppressedByAuxiliary,
       contentPaneWidth: Math.max(0, viewportWidth - primarySidebarWidth),
       supportsAuxiliaryPane: fileInspector.supported,
@@ -235,6 +238,7 @@ export function deriveWorkspacePaneLayout(input: {
 
   return {
     primarySidebarVisible: preferredPrimarySidebarVisible,
+    primarySidebarWhenExpanded: input.primarySidebarPreferredVisible,
     primarySidebarSuppressedByAuxiliary: false,
     contentPaneWidth,
     supportsAuxiliaryPane,

docs/operations/mobile-screens-fork.md

@@ -1,7 +1,7 @@
 # Building the mobile Screens dependency
 
 The mobile v5 stack uses a committed tarball from the
-[T3 Screens fork](https://github.com/pingdotgg/react-native-screens/tree/t3-v5.0.0-t3.31).
+[T3 Screens fork](https://github.com/pingdotgg/react-native-screens/tree/t3-v5.0.0-t3.32).
 The fork owns the integration changes; the app does not patch this package.
 Each archive includes compiled JavaScript, declarations, native source and
 `t3-fork.json` recording its version, source commit and upstream base.