Restore BatchActionResultModal usage in forward.tsx

- Add BatchOperationFailure type import
- Add BatchActionResultModal component import
- Add BatchResultModalState interface and empty state constant
- Add batchResultModal state
- Add presentBatchOutcome callback for unified batch operation result handling
- Update handleBatchDelete to use presentBatchOutcome
- Add BatchActionResultModal rendering at end of component

vite-frontend/src/pages/forward/batch-actions.ts

@@ -223,4 +223,4 @@ export const executeForwardBatchChangeTunnel = async (
       shouldRefresh: false,
     };
   }
-};
+};