pack: rename runner directory

.runner/devClient.mjs

@@ -0,0 +1,15 @@
+import * as hotClient from 'webpack-hot-middleware/client.js?noInfo=true&reload=true'
+
+hotClient.subscribe(event => {
+  if (event.action === 'compiling') {
+    document.body.innerHTML += `
+      <style>
+        .root {
+          color: #000;
+          padding: 10px 20px
+        }
+      </style>
+      <div class="root">Compiling Main Process...</div>
+    `
+  }
+})