fix: forge UI updates forgeLevel after success — prix/taux rafraîchis

frontend/src/pages/ForgePage.tsx

@@ -75,6 +75,10 @@ export function ForgePage() {
     mutationFn: () => forgeApi.upgrade(selected!.id),
     onSuccess: (res) => {
       setLastResult({ success: res.success, newLevel: res.forgeLevel });
+      // Update selected item forgeLevel locally for immediate UI refresh
+      if (res.success) {
+        setSelected(prev => prev ? { ...prev, forgeLevel: res.forgeLevel } : null);
+      }
       qc.invalidateQueries({ queryKey: ['inventory'] });
       qc.invalidateQueries({ queryKey: ['character'] });
     },