[Electron] Add basic welcome screen (#1491)

* WIP

* Add LogTerminal

* Modify server startup view

* Add installView

* Add basic welcome screen and dev server setup

* nit

* nit

* nit

* nit

* nit

vite.electron.config.mts

@@ -0,0 +1,33 @@
+import { defineConfig, Plugin } from 'vite'
+import { mergeConfig } from 'vite'
+import type { UserConfig } from 'vitest/config'
+import baseConfig from './vite.config.mts'
+import type { ElectronAPI } from '@comfyorg/comfyui-electron-types'
+
+const electronAPIMock: Partial<ElectronAPI> = {
+  sendReady: () => {},
+  onShowSelectDirectory: () => {},
+  onFirstTimeSetupComplete: () => {},
+  onProgressUpdate: () => {},
+  onLogMessage: () => {},
+  isFirstTimeSetup: () => Promise.resolve(true)
+}
+
+const mockElectronAPI: Plugin = {
+  name: 'mock-electron-api',
+  transformIndexHtml() {
+    return [
+      {
+        tag: 'script',
+        children: `window.electronAPI = ${JSON.stringify(electronAPIMock)};`
+      }
+    ]
+  }
+}
+
+export default mergeConfig(
+  baseConfig as unknown as UserConfig,
+  defineConfig({
+    plugins: [mockElectronAPI]
+  })
+)