fix: silence container fetch error toast on demo/fresh installs

No deployed containers is normal state. Don't show a red error toast
every 10 seconds when Docker container list fails or times out.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: smashingtags

src/App.tsx

@@ -149,7 +149,8 @@ export default function App() {
       }));
       setDeployedApps(apps);
     } catch (err) {
-      showError('Failed to fetch containers', 'Unable to connect to Docker or retrieve container information');
+      // Silently fail - no deployed containers is normal for fresh installs/demos
+      console.warn('Container fetch failed:', err);
     }
   };