Merge pull request #15207 from overleaf/ii-ide-page-prototype-file-outline

File outline for React IDE page

GitOrigin-RevId: 18bfad1d59c5be5f1a2808f8ede62fe95e595dc5

services/web/frontend/js/features/ide-react/components/editor-sidebar.tsx

@@ -27,7 +27,9 @@ export default function EditorSidebar({
           <FileTree onInit={onFileTreeInit} onSelect={onFileTreeSelect} />
         </Panel>
         <VerticalResizeHandle />
-        <Panel defaultSize={25}>File outline placeholder</Panel>
+        <Panel defaultSize={25}>
+          <div className="outline-container" />
+        </Panel>
       </PanelGroup>
     </aside>
   )