fix: onboarding validation

apps/edr-freight-web/portal/src/utils/result.ts

@@ -34,6 +34,16 @@ function humanizeApiMessage(raw: string): string {
   return raw;
 }
 
+/**
+ * NestJS's ValidationPipe reports every failed constraint at once, so `message`
+ * arrives as a string[] rather than a string. Flatten it — passing the array
+ * through left the UI rendering its entries run together with no separator.
+ */
+function asMessage(value: unknown): string {
+  if (Array.isArray(value)) return value.filter(Boolean).join(". ");
+  return typeof value === "string" ? value : "";
+}
+
 export function extractApiError(err: unknown): ApiError {
   if (err && typeof err === "object") {
     const obj = err as Record<string, unknown>;
@@ -41,13 +51,10 @@ export function extractApiError(err: unknown): ApiError {
     if (response) {
       const statusCode = response.status as number | undefined;
       const data = response.data as Record<string, unknown> | undefined;
+      const raw = asMessage(data?.message) || asMessage(data?.error);
       return {
-        code: (data?.message as string) || (data?.error as string) || "api_error",
-        message: humanizeApiMessage(
-          (data?.message as string) ||
-            (data?.error as string) ||
-            "An unexpected error occurred",
-        ),
+        code: raw || "api_error",
+        message: humanizeApiMessage(raw || "An unexpected error occurred"),
         statusCode,
       };
     }