Add Window interface to app.d.ts for file handling and logging

- Extended the Window interface to include a go property with methods for saving and loading files, as well as logging messages from the frontend.
- This enhancement supports improved interaction with the application’s file management features.

src/app.d.ts

@@ -8,6 +8,19 @@ declare global {
 		// interface PageState {}
 		// interface Platform {}
 	}
+
+	interface Window {
+		go?: {
+			main: {
+				App: {
+					SaveFile(filename: string, content: string): Promise<string>;
+					LoadFile(): Promise<string>;
+					LogFrontend(message: string): void;
+				};
+			};
+		};
+		runtime?: unknown;
+	}
 }
 
 export {};