Center tab labels and unify dock cursor resolution

new_editor/include/XCEditor/Shell/UIEditorDockHost.h

@@ -138,6 +138,12 @@ struct UIEditorDockHostLayout {
     UIEditorDockHostDropPreviewLayout dropPreview = {};
 };
 
+enum class UIEditorDockHostCursorKind : std::uint8_t {
+    Arrow = 0,
+    ResizeEW,
+    ResizeNS
+};
+
 // Allows higher-level compose to own panel body presentation while DockHost
 // keeps drawing the surrounding chrome/frame.
 struct UIEditorDockHostForegroundOptions {
@@ -148,6 +154,9 @@ const UIEditorDockHostSplitterLayout* FindUIEditorDockHostSplitterLayout(
     const UIEditorDockHostLayout& layout,
     std::string_view nodeId);
 
+UIEditorDockHostCursorKind ResolveUIEditorDockHostCursorKind(
+    const UIEditorDockHostLayout& layout);
+
 UIEditorDockHostLayout BuildUIEditorDockHostLayout(
     const ::XCEngine::UI::UIRect& bounds,
     const UIEditorPanelRegistry& panelRegistry,