Add error handling to checkStatus() to prevent console errors

The periodic /status check was throwing uncaught promise errors
when the server was unavailable or restarting.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/index.html

@@ -3114,6 +3114,9 @@
                             startStream();
                         }
                     }
+                })
+                .catch(() => {
+                    // Silently ignore - server may be restarting or network issue
                 });
         }