diff --git a/03_implementation/ui/src/app/AppShell.tsx b/03_implementation/ui/src/app/AppShell.tsx
index 4bc3b5cc..c8448a31 100644
--- a/03_implementation/ui/src/app/AppShell.tsx
+++ b/03_implementation/ui/src/app/AppShell.tsx
@@ -21,7 +21,7 @@ export function AppShell({ children }: { children?: ReactNode }) {
       <Sidebar />
       <div className="flex min-h-0 flex-1 flex-col">
         <TopBar activeLabel={activeTab.label} />
-        <main className={dashboard ? "min-h-0 flex-1 overflow-auto p-2.5 lg:overflow-hidden" : "min-h-0 flex-1 overflow-auto p-2.5"}>
+        <main className={dashboard ? "min-h-0 flex-1 overflow-auto p-2.5" : "min-h-0 flex-1 overflow-auto p-2.5"}>
           {children}
         </main>
       </div>
diff --git a/03_implementation/ui/src/components/layout/Sidebar.tsx b/03_implementation/ui/src/components/layout/Sidebar.tsx
index e011351a..74d9c980 100644
--- a/03_implementation/ui/src/components/layout/Sidebar.tsx
+++ b/03_implementation/ui/src/components/layout/Sidebar.tsx
@@ -32,7 +32,9 @@ export function Sidebar() {
           />
         ))}
       </nav>
-      <AgentChatMirror />
+      <div className="min-h-0 shrink overflow-hidden">
+        <AgentChatMirror />
+      </div>
     </ResizablePane>
   );
 }
diff --git a/03_implementation/ui/src/components/layout/TopBar.tsx b/03_implementation/ui/src/components/layout/TopBar.tsx
index dbe7d4e6..bdc04f64 100644
--- a/03_implementation/ui/src/components/layout/TopBar.tsx
+++ b/03_implementation/ui/src/components/layout/TopBar.tsx
@@ -27,17 +27,26 @@ export function TopBar({ activeLabel }: { activeLabel: string }) {
 
   useEffect(() => {
     let mounted = true;
-    void adapters.getSystemSnapshot().then((snapshot) => {
-      if (mounted) setSys(snapshot);
-    });
-    void adapters.getNotifications().then((items) => {
-      if (mounted) setNotifications(items);
-    });
-    void adapters.getLatestProofBundle().then((bundle) => {
-      if (mounted) setLatestProof(bundle);
-    });
+
+    const fetchAll = () => {
+      void adapters.getSystemSnapshot().then((snapshot) => {
+        if (mounted) setSys(snapshot);
+      });
+      void adapters.getNotifications().then((items) => {
+        if (mounted) setNotifications(items);
+      });
+      void adapters.getLatestProofBundle().then((bundle) => {
+        if (mounted) setLatestProof(bundle);
+      });
+    };
+
+    fetchAll();
+    // Refresh system status every 10 s — non-critical display data; 10 s avoids render churn.
+    const timer = window.setInterval(fetchAll, 10_000);
+
     return () => {
       mounted = false;
+      window.clearInterval(timer);
     };
   }, []);