fix: fullscreen button not working

js/src/preload.ts

@@ -5,6 +5,7 @@ import { contextBridge, ipcRenderer } from 'electron';
 contextBridge.exposeInMainWorld('electronWindow', {
   minimize: () => ipcRenderer.send('window:minimize'),
   maximize: () => ipcRenderer.send('window:maximize'),
+  fullscreen: () => ipcRenderer.send('window:fullscreen'),
   close: () => ipcRenderer.send('window:close'),
 });