Added basic "publish" block logic.

layouts/scripts/toolbar/publish.jsx

@@ -0,0 +1,47 @@
+import React, {useEffect, useState} from 'react';
+import * as ReactDOM from 'react-dom/client';
+
+function Publish(props = {}) {
+  const [state, setState] = useState({loading: false});
+  const updateState = (update) => setState(Object.assign({}, state, update));
+
+  return <div>
+    {state.loading &&
+      <div className="overlay overlay--loading">Loading, Please wait...</div>
+    }
+    <button onClick={submit} disabled={state.loading} className="btn btn--primary">Publish</button>
+  </div>;
+
+  async function submit() {
+    const ready = confirm('Are you ready to submit the code?');
+    if (!ready) {
+      return;
+    }
+
+    updateState({loading: true});
+
+    try {
+      const response = await fetch(`/publish`);
+      const data = await response.json();
+      if (data.success) {
+        alert('Your code is successfully sent to project manager! Thank you!');
+      } else {
+        alert('Can\'t send your code, please try again or contact project manager.');
+      }
+    } catch (error) {
+      alert('Something went wrong, please try again or contact project manager.');
+    }
+
+    updateState({loading: false});
+  }
+}
+
+export function setupPublish(rootAttributes) {
+  // INIT
+  const wrapper = document.createElement('div');
+  document.querySelector('.page_toolbar__right').prepend(wrapper)
+
+  const root = ReactDOM.createRoot(wrapper);
+  const html = (<Publish rootAttributes={rootAttributes}/>);
+  root.render(html);
+}

layouts/scripts/toolbar/responsive.jsx

@@ -73,7 +73,7 @@ function Responsive(props = {}) {
 export function setupResponsiveness(rootAttributes) {
   // INIT
   const wrapper = document.createElement('div');
-  document.querySelector('.page_toolbar').prepend(wrapper)
+  document.querySelector('.page_toolbar__middle').prepend(wrapper)
 
   const root = ReactDOM.createRoot(wrapper);
   const html = (<Responsive rootAttributes={rootAttributes}/>);