T20: Pass yjsDocRef to RibbonBar in App.tsx

frontend/src/App.tsx

@@ -34,7 +34,7 @@ function AppContent() {
 
   return (
     <div className={`app-container ${theme}`} data-theme={theme}>
-      <RibbonBar onTabChange={handleRibbonTabChange} />
+      <RibbonBar onTabChange={handleRibbonTabChange} yjsDoc={yjsDocRef} />
       <div className="main-content">
         <CanvasArea ref={canvasRef} />
         <SidePanel canvasRef={canvasRef} yjsDoc={yjsDocRef} />