fix: onboarding address required fallback; ticket staleTime:0 for instant status refresh

app/(app)/clients/new.tsx

@@ -135,9 +135,9 @@ export default function NewClientScreen() {
         firstName: firstName.trim(),
         lastName:  lastName.trim(),
         phone:     phone.trim(),
-        ...(email.trim()   ? { email:   email.trim() }   : {}),
-        ...(address.trim() ? { address: address.trim() } : {}),
-        ...(areaId         ? { areaId }                   : {}),
+        address:   address.trim() || '—',   // API requires non-empty address
+        ...(email.trim() ? { email: email.trim() } : {}),
+        ...(areaId       ? { areaId }               : {}),
       });
       const client = clientRes.data;