Fix mobile scroll

frontend/src/App.tsx

@@ -981,7 +981,7 @@ export function App() {
   );
 
   return (
-    <div className="flex flex-col h-screen">
+    <div className="flex flex-col h-dvh">
       <StatusBar
         health={health}
         config={config}

frontend/src/styles.css

@@ -6,8 +6,21 @@
   padding: 0;
 }
 
+html, body, #root {
+  height: 100%;
+}
+
 body {
   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+  /* Prevent overscroll/bounce on mobile */
+  overscroll-behavior: none;
+}
+
+/* Fallback for browsers without dvh support */
+@supports not (height: 1dvh) {
+  .h-dvh {
+    height: 100vh;
+  }
 }
 
 /* Mobile sidebar override - ensures sidebar fills Sheet container */