feat: cow desktop first version

desktop/src/main/preload.ts

@@ -0,0 +1,19 @@
+import { contextBridge, ipcRenderer } from 'electron'
+
+contextBridge.exposeInMainWorld('electronAPI', {
+  getBackendPort: () => ipcRenderer.invoke('get-backend-port'),
+  getBackendStatus: () => ipcRenderer.invoke('get-backend-status'),
+  restartBackend: () => ipcRenderer.invoke('restart-backend'),
+  selectDirectory: () => ipcRenderer.invoke('select-directory'),
+  selectFile: (filters?: Electron.FileFilter[]) => ipcRenderer.invoke('select-file', filters),
+
+  onBackendStatus: (callback: (data: { status: string; port?: number; error?: string }) => void) => {
+    ipcRenderer.on('backend-status', (_event, data) => callback(data))
+  },
+
+  onBackendLog: (callback: (line: string) => void) => {
+    ipcRenderer.on('backend-log', (_event, line) => callback(line))
+  },
+
+  platform: process.platform,
+})