frontend tweaks, preview workspace

frontend/src/sidebar/Sidebar.jsx

@@ -291,12 +291,6 @@ const Sidebar = ({
   );
 
   const rootNode = folderNodes.get('root');
-  const hintText = appStatus === 'bootstrapping' && loading
-    ? 'Loading your library…'
-    : previewActive
-    ? 'Viewing document preview. Press ← Back to return to the library.'
-    : 'Drag files here to upload.';
-
   return (
     <aside className="sidebar">
       <div className="panel-header sidebar__header">
@@ -371,7 +365,6 @@ const Sidebar = ({
         </div>
       </div>
       <div className="panel-body sidebar__body">
-        <span className="sidebar__hint">{hintText}</span>
         {status && (
           <div className="sidebar__status">
             <div className={`status-banner ${status.variant}`}>{status.message}</div>