Refine stacked diff view

packages/ui/src/stores/useUIStore.ts

@@ -579,7 +579,6 @@ interface UIStore {
   diffLayoutPreference: 'dynamic' | 'inline' | 'side-by-side';
   diffFileLayout: Record<string, 'inline' | 'side-by-side'>;
   diffWrapLines: boolean;
-  diffViewMode: 'single' | 'stacked';
   gitChangesViewMode: 'flat' | 'tree';
   isTimelineDialogOpen: boolean;
   isImagePreviewOpen: boolean;
@@ -735,7 +734,6 @@ interface UIStore {
   setDiffLayoutPreference: (mode: 'dynamic' | 'inline' | 'side-by-side') => void;
   setDiffFileLayout: (filePath: string, mode: 'inline' | 'side-by-side') => void;
   setDiffWrapLines: (wrap: boolean) => void;
-  setDiffViewMode: (mode: 'single' | 'stacked') => void;
   setGitChangesViewMode: (mode: 'flat' | 'tree') => void;
   setMultiRunLauncherOpen: (open: boolean) => void;
   setTimelineDialogOpen: (open: boolean) => void;
@@ -864,7 +862,6 @@ export const useUIStore = create<UIStore>()(
         diffLayoutPreference: 'inline',
         diffFileLayout: {},
         diffWrapLines: false,
-        diffViewMode: 'stacked',
         gitChangesViewMode: 'flat',
         isTimelineDialogOpen: false,
         isImagePreviewOpen: false,
@@ -1681,10 +1678,6 @@ export const useUIStore = create<UIStore>()(
           set({ diffWrapLines: wrap });
         },
 
-        setDiffViewMode: (mode) => {
-          set({ diffViewMode: mode });
-        },
-
         setGitChangesViewMode: (mode) => {
           set({ gitChangesViewMode: mode });
         },
@@ -2086,13 +2079,18 @@ export const useUIStore = create<UIStore>()(
       {
         name: 'ui-store',
         storage: createJSONStorage(() => getSafeStorage()),
-        version: 9,
+        version: 10,
         migrate: (persistedState, version) => {
           if (!persistedState || typeof persistedState !== 'object') {
             return persistedState;
           }
           const state = persistedState as Record<string, unknown>;
 
+          // v9 -> v10: remove obsolete single-file diff view mode setting
+          if (version < 10) {
+            delete state.diffViewMode;
+          }
+
           // v8 -> v9: initialize notes/todo panel height fields
           if (version < 9) {
             if (typeof state.notesPanelHeight !== 'number' || !Number.isFinite(state.notesPanelHeight)) {
@@ -2225,7 +2223,6 @@ export const useUIStore = create<UIStore>()(
           recentEfforts: state.recentEfforts,
           diffLayoutPreference: state.diffLayoutPreference,
           diffWrapLines: state.diffWrapLines,
-          diffViewMode: state.diffViewMode,
           gitChangesViewMode: state.gitChangesViewMode,
           nativeNotificationsEnabled: state.nativeNotificationsEnabled,
           notificationMode: state.notificationMode,