add hard capacity ceiling to weight limit rules

apps/edr-freight-web/backoffice/src/pages/ruleEngine/RuleEngineResourcePage.tsx

@@ -341,6 +341,10 @@ const RuleEngineResourcePage = () => {
     } else if (config.slug === "priority-configs") {
       // Label is required by the backend but hidden in the UI for now.
       payload = { ...values, label: String(Date.now()) };
+    } else if (config.slug === "weight-limit-rules") {
+      // Empty max capacity means "no ceiling" — send null explicitly so an
+      // edit can clear a previously-set ceiling (omitting the key keeps it).
+      payload = { ...values, maxCapacityTons: values.maxCapacityTons ?? null };
     }
 
     if (editing?.id) {