Add Electron E2E harness launcher

electron/main.cts

@@ -10,6 +10,7 @@ const { validateRenderRequest } = require('../shared/renderValidation.cjs') as {
 }
 
 const isDev = !app.isPackaged
+const isE2E = process.env.RUWIO_E2E === '1'
 const devServerUrl = process.env.VITE_DEV_SERVER_URL ?? 'http://localhost:5200'
 const devServerOrigin = new URL(devServerUrl).origin
 const appIconPath = isDev
@@ -43,6 +44,12 @@ function sendAppCommand(command: string): void {
   mainWindow.webContents.send('ruwio:menu-command', command)
 }
 
+declare global {
+  // Playwright's Electron runner can evaluate in the main process and call this
+  // env-gated hook without expanding the preload bridge surface.
+  var __ruwioTestMenuCommand: ((command: string) => void) | undefined
+}
+
 function sendRenderProgress(
   target: Electron.WebContents,
   event: { jobId: string; progress: number; done: boolean; error?: string },
@@ -101,9 +108,14 @@ async function runRenderMp4(event: IpcMainInvokeEvent, payload: RenderMp4Payload
     defaultPath: sanitizeMp4Name(payload?.suggestedName),
     filters: [{ name: 'MP4 Video', extensions: ['mp4'] }],
   }
-  const saveResult = window
-    ? await dialog.showSaveDialog(window, saveOptions)
-    : await dialog.showSaveDialog(saveOptions)
+  const e2eSavePath = isE2E
+    ? process.env.RUWIO_E2E_SAVE_PATH || path.join(app.getPath('temp'), saveOptions.defaultPath)
+    : ''
+  const saveResult = e2eSavePath
+    ? { canceled: false, filePath: e2eSavePath }
+    : window
+      ? await dialog.showSaveDialog(window, saveOptions)
+      : await dialog.showSaveDialog(saveOptions)
   if (saveResult.canceled || !saveResult.filePath) return null
 
   const jobId = randomUUID()
@@ -379,6 +391,9 @@ app.setName('RUWIO')
 app.whenReady().then(() => {
   ipcMain.handle('ruwio:render-mp4', handleRenderMp4)
   ipcMain.handle('ruwio:render-cancel', handleRenderCancel)
+  if (isE2E) {
+    globalThis.__ruwioTestMenuCommand = (command: string) => sendAppCommand(command)
+  }
   createMenu()
   createMainWindow()