refactor: centralize unhandled rejection setup

src/infra/bonjour-errors.ts

@@ -0,0 +1,7 @@
+export function formatBonjourError(err: unknown): string {
+  if (err instanceof Error) {
+    const msg = err.message || String(err);
+    return err.name && err.name !== "Error" ? `${err.name}: ${msg}` : msg;
+  }
+  return String(err);
+}