fix: expose ElectronAPI to window in preload script

- Add window.ea = ea to make ElectronAPI available for ipc-event.ts
- Fixes 'Cannot read properties of undefined (reading on)' error in Electron build
- Ensures proper IPC communication between renderer and main process

electron/preload.ts

@@ -110,3 +110,6 @@ const ea: ElectronAPI = {
       request,
     ) as Promise<PluginNodeScriptResult>,
 };
+
+// Expose ea to window for ipc-event.ts
+(window as any).ea = ea;