Align fullscreen return button with project actions

electron/preload/index.ts

@@ -33,6 +33,7 @@ const validInvokeChannels = [
   'window:maximize',
   'window:close',
   'window:isMaximized',
+  'window:isFullScreen',
   'settings:get',
   'settings:set',
   'settings:setMany',
@@ -64,6 +65,7 @@ const validInvokeChannels = [
 ];
 
 const validEventChannels = [
+  'window:fullscreen-changed',
   'navigate',
   'cloud-agent-link',
   'update:status-changed',