feat(mobile): add context-sensitive MindSift logo menu, slide-over file drawer, and larger touch targets

frontend/src/main.tsx

@@ -1,10 +1,14 @@
 import React from 'react';
 import ReactDOM from 'react-dom/client';
 import App from './App';
+import { MobileActionProvider } from './context/MobileActionContext';
 import './index.css';
 
 ReactDOM.createRoot(document.getElementById('root')!).render(
   <React.StrictMode>
-    <App />
+    <MobileActionProvider>
+      <App />
+    </MobileActionProvider>
   </React.StrictMode>
 );
+