feat: add isMainWindowOpen functionality and enhance game launcher UI

src/main/events/misc/index.ts

@@ -7,6 +7,7 @@ import "./get-hydra-decky-plugin-info";
 import "./hydra-api-call";
 import "./install-common-redist";
 import "./install-hydra-decky-plugin";
+import "./is-main-window-open";
 import "./open-checkout";
 import "./open-external";
 import "./open-main-window";

src/main/events/misc/is-main-window-open.ts

@@ -0,0 +1,12 @@
+import { registerEvent } from "../register-event";
+import { WindowManager } from "@main/services";
+
+const isMainWindowOpen = async () => {
+  return (
+    WindowManager.mainWindow !== null &&
+    !WindowManager.mainWindow.isDestroyed() &&
+    WindowManager.mainWindow.isVisible()
+  );
+};
+
+registerEvent("isMainWindowOpen", isMainWindowOpen);