Warn on tab close when create-flow module or wizard edits have not been saved.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/(app)/create/screens/right-rail/DecisionApproachesScreen.tsx

@@ -26,6 +26,7 @@ import type { InfoMessageBoxItem } from "../../../../components/controls/InfoMes
 import { useMessages } from "../../../../contexts/MessagesContext";
 import { useCreateFlow } from "../../context/CreateFlowContext";
 import { useCreateFlowMdUp } from "../../hooks/useCreateFlowMdUp";
+import { useBeforeUnloadGuard } from "../../../../hooks/useBeforeUnloadGuard";
 import { useDiscardCustomizeConfirm } from "../../hooks/useDiscardCustomizeConfirm";
 import { useMethodCardDeckOrdering } from "../../hooks/useMethodCardDeckOrdering";
 import { CreateFlowTwoColumnSelectShell } from "../../components/CreateFlowTwoColumnSelectShell";
@@ -60,6 +61,7 @@ import { buildMethodCardWizardInitialValues } from "../../../../../lib/create/me
 import type { MethodCardWizardInitialValues } from "../../../../../lib/create/methodCardWizardPrefill";
 import {
   captureMethodCardCustomizeSnapshot,
+  isMethodCardCustomizeUnloadBlocked,
   type MethodCardCustomizeSnapshot,
   type MethodCardHeaderDraft,
 } from "../../../../../lib/create/methodCardCustomizeSession";
@@ -91,6 +93,16 @@ export function DecisionApproachesScreen() {
     CustomMethodCardFieldBlock[] | null
   >(null);
 
+  useBeforeUnloadGuard(
+    isMethodCardCustomizeUnloadBlocked(
+      createModalOpen,
+      customizeSnapshotRef.current,
+      pendingDraft,
+      draftFieldBlocks,
+      customizeSnapshotRef.current?.headerDraft ?? null,
+    ),
+  );
+
   const selectedIds = state.selectedDecisionApproachIds ?? [];
   const messageBoxCheckedIds = decisionApproachKeyResourceCheckboxIds({
     detailsById: state.decisionApproachDetailsById,