feat(preview): call customCode (importCode/useCode) on both server an…

…d client on SSR

- define 2 flags in context: SSR_SERVER (true on server) and SSR_CLIENT (true on client if coming from SSR_SERVER)

src/output/Preview.vue

@@ -193,13 +193,17 @@ async function updatePreview() {
         ...ssrModules,
         `import { renderToString as _renderToString } from 'vue/server-renderer'
          import { createSSRApp as _createApp } from 'vue'
+         const SSR_SERVER = true
+         const SSR_CLIENT = false
+         ${previewOptions?.customCode?.importCode || ''}
          const AppComponent = __modules__["${mainFile}"].default
          AppComponent.name = 'Repl'
          const app = _createApp(AppComponent)
          if (!app.config.hasOwnProperty('unwrapInjectedRef')) {
            app.config.unwrapInjectedRef = true
          }
          app.config.warnHandler = () => {}
+         ${previewOptions?.customCode?.useCode || ''}
          window.__ssr_promise__ = _renderToString(app).then(html => {
            document.body.innerHTML = '<div id="app">' + html + '</div>' + \`${
              previewOptions?.bodyHTML || ''
@@ -240,6 +244,8 @@ async function updatePreview() {
         `import { ${
           isSSR ? `createSSRApp` : `createApp`
         } as _createApp } from "vue"
+        const SSR_SERVER = false
+        const SSR_CLIENT = ${String(isSSR)}
         ${previewOptions?.customCode?.importCode || ''}
         const _mount = () => {
           const AppComponent = __modules__["${mainFile}"].default