Extract detection and segmentation workflow hooks

frontend/src/lib/formatError.ts

@@ -0,0 +1,7 @@
+export function formatError(error: unknown, fallback: string): string {
+  if (error instanceof Error) {
+    const code = (error as { code?: string }).code
+    return code ? `${error.message} (${code})` : error.message
+  }
+  return fallback
+}