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/select/CoreValuesSelectScreen.tsx

@@ -9,6 +9,7 @@ import { useMessages } from "../../../../contexts/MessagesContext";
 import { buildCoreValueChipOptionsFromDraft } from "../../../../../lib/create/coreValueChipOptionsFromDraft";
 import { useCreateFlow } from "../../context/CreateFlowContext";
 import { useAsyncConfirm } from "../../../../hooks/useAsyncConfirm";
+import { useBeforeUnloadGuard } from "../../../../hooks/useBeforeUnloadGuard";
 import type {
   CommunityStructureChipSnapshotRow,
   CoreValueDetailEntry,
@@ -257,6 +258,14 @@ export function CoreValuesSelectScreen() {
     });
   }, [cv.detailModal, draft, modalSession, requestConfirm]);
 
+  useBeforeUnloadGuard(
+    activeModalChipId != null &&
+      !addCustomWizardOpen &&
+      initialDraftRef.current != null &&
+      (draft.meaning !== initialDraftRef.current.meaning ||
+        draft.signals !== initialDraftRef.current.signals),
+  );
+
   const handleDuplicateCoreChip = useCallback(() => {
     if (!activeModalChipId || !modalSession) return;
     markCreateFlowInteraction();