optimize sse

src/Controller/AskSseController.php

@@ -65,10 +65,9 @@ final readonly class AskSseController
                         $this->sendData($chunk);
                     }
                 } catch (\Throwable $e) {
-                    $this->sendData(
-                        '<span class="text-danger">❌ Stream abgebrochen: '
-                        . htmlspecialchars($e->getMessage(), ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8')
-                        . '</span>'
+                    $this->sendEvent(
+                        'error',
+                        '❌ Stream abgebrochen: ' . $e->getMessage()
                     );
                 }