fix: cleaner components seperation

src/app/core/http/error-message.util.ts

@@ -0,0 +1,8 @@
+export function getErrorMessage(error: unknown, fallback: string): string {
+  if (!error || typeof error !== 'object') {
+    return fallback;
+  }
+
+  const httpError = error as { error?: { message?: unknown } };
+  return typeof httpError.error?.message === 'string' ? httpError.error.message : fallback;
+}