feat: Add "Pin selected notes" button to editor title bar (#760)

app/assets/javascripts/components/MultipleSelectedNotes.tsx

@@ -4,6 +4,7 @@ import NotesIcon from '../../icons/il-notes.svg';
 import { observer } from 'mobx-react-lite';
 import { NotesOptionsPanel } from './NotesOptionsPanel';
 import { WebApplication } from '@/ui_models/application';
+import { PinNoteButton } from './PinNoteButton';
 
 type Props = {
   application: WebApplication;
@@ -17,13 +18,16 @@ const MultipleSelectedNotes = observer(({ application, appState }: Props) => {
     <div className="flex flex-col h-full items-center">
       <div className="flex items-center justify-between p-4 w-full">
         <h1 className="sk-h1 font-bold m-0">{count} selected notes</h1>
-        <NotesOptionsPanel application={application} appState={appState} />
+        <div className="flex">
+          <div className="mr-3">
+            <PinNoteButton appState={appState} />
+          </div>
+          <NotesOptionsPanel application={application} appState={appState} />
+        </div>
       </div>
       <div className="flex-grow flex flex-col justify-center items-center w-full max-w-md">
         <NotesIcon className="block" />
-        <h2 className="text-lg m-0 text-center mt-4">
-          {count} selected notes
-        </h2>
+        <h2 className="text-lg m-0 text-center mt-4">{count} selected notes</h2>
         <p className="text-sm mt-2 text-center max-w-60">
           Actions will be performed on all selected notes.
         </p>