Add display layout helper wrappers

pkg/display/display.go

@@ -35,6 +35,9 @@ type Options struct{}
 // WindowInfo is an alias for window.WindowInfo (backward compatibility).
 type WindowInfo = window.WindowInfo
 
+// LayoutSuggestion is an alias for window.LayoutSuggestion (backward compatibility).
+type LayoutSuggestion = window.LayoutSuggestion
+
 // Service manages windowing, dialogs, and other visual elements.
 // It orchestrates sub-services (window, systray, menu) via IPC and bridges
 // IPC actions to WebSocket events for TypeScript apps.
@@ -1501,6 +1504,34 @@ func (s *Service) FindSpace(width, height int) (window.SpaceInfo, error) {
 	return ws.Manager().FindSpace(screenWidth, screenHeight, width, height), nil
 }
 
+// SuggestLayout returns a recommended arrangement for the current screen.
+// Use: suggestion, err := svc.SuggestLayout(3, 1920, 1080)
+func (s *Service) SuggestLayout(windowCount, screenWidth, screenHeight int) (window.LayoutSuggestion, error) {
+	result, handled, err := s.Core().QUERY(window.QueryLayoutSuggestion{
+		WindowCount:  windowCount,
+		ScreenWidth:  screenWidth,
+		ScreenHeight: screenHeight,
+	})
+	if err != nil {
+		return window.LayoutSuggestion{}, err
+	}
+	if !handled {
+		return window.LayoutSuggestion{}, fmt.Errorf("window service not available")
+	}
+	suggestion, _ := result.(window.LayoutSuggestion)
+	return suggestion, nil
+}
+
+// BesideEditor positions a target window beside an editor window.
+// Use: _ = svc.BesideEditor("editor", "assistant")
+func (s *Service) BesideEditor(editorName, windowName string) error {
+	_, _, err := s.Core().PERFORM(window.TaskBesideEditor{
+		Editor: editorName,
+		Window: windowName,
+	})
+	return err
+}
+
 // --- Screen management ---
 
 // GetScreens returns all known screens.

pkg/display/display_test.go

@@ -689,6 +689,28 @@ func TestServiceWrappers_Good(t *testing.T) {
 		require.NotNil(t, screenInfo)
 	})
 
+	t.Run("layout helpers", func(t *testing.T) {
+		suggestion, err := svc.SuggestLayout(2, 2560, 1440)
+		require.NoError(t, err)
+		assert.Equal(t, "side-by-side", suggestion.Mode)
+
+		require.NoError(t, svc.OpenWindow(window.WithName("editor-beside"), window.WithSize(800, 600)))
+		require.NoError(t, svc.OpenWindow(window.WithName("assistant-beside"), window.WithSize(400, 600)))
+		require.NoError(t, svc.BesideEditor("editor-beside", "assistant-beside"))
+
+		editorInfo, err := svc.GetWindowInfo("editor-beside")
+		require.NoError(t, err)
+		require.NotNil(t, editorInfo)
+		assert.Equal(t, 0, editorInfo.X)
+		assert.Equal(t, 1792, editorInfo.Width)
+
+		assistantInfo, err := svc.GetWindowInfo("assistant-beside")
+		require.NoError(t, err)
+		require.NotNil(t, assistantInfo)
+		assert.Equal(t, 1792, assistantInfo.X)
+		assert.Equal(t, 768, assistantInfo.Width)
+	})
+
 	t.Run("clipboard wrappers", func(t *testing.T) {
 		text, err := svc.ReadClipboard()
 		require.NoError(t, err)