[feat] add DeskHub device wall and shared group actions

apps/desktop/src/platform/window_drag.h

@@ -8,10 +8,20 @@ namespace crossdesk {
 // left-mouse-down event. Returns false when no suitable native event exists.
 bool StartNativeWindowDrag();
 
-// Sets a fixed white native titlebar and hides the disabled zoom button on
-// the fixed-size main window. |slint_view| is its AppKit NSView*. Returns false
-// while the native window or its fixed-size constraints are not ready.
-bool ConfigureMainWindowChrome(void* slint_view);
+// Sets a white native titlebar and hides its zoom button in both main-window
+// modes. DeskHub remains resizable. |slint_view| is its AppKit NSView*.
+// Returns false while the native window or its titlebar controls are not ready.
+bool ConfigureMainWindowChrome(void* slint_view, bool gallery = false);
+// Winit's initial macOS position is a content origin, while subsequent moves
+// use the outer frame. Return the logical titlebar inset for initial placement.
+float MainWindowInitialPositionYOffset();
+bool SetMainWindowFullscreen(bool fullscreen);
+bool IsMainWindowFullscreen();
+bool IsMainWindowActive();
+// AppKit's animated zoom spins a nested run loop and cannot be called from a
+// Slint timer. Restore maximization by setting the visible screen frame directly.
+bool MaximizeMainWindowWithoutAnimation();
+bool IsMainWindowMaximized();
 
 // Configures live resize and replaces the stream window's native Space
 // fullscreen action with an immediate, single-window fullscreen transition.