fix: confirm leaving unsaved map edits

frontend/src/pages/LocationMapManager.jsx

@@ -66,6 +66,7 @@ export default function LocationMapManager() {
   const [future, setFuture] = useState([]);
   const [dragState, setDragState] = useState(null);
   const [pendingDeleteObject, setPendingDeleteObject] = useState(null);
+  const [pendingLeave, setPendingLeave] = useState(false);
   const svgRef = useRef(null);
   const toastRef = useRef(toast);
 
@@ -402,7 +403,7 @@ export default function LocationMapManager() {
     setZoom(Number(nextZoom.toFixed(2)));
   };
 
-  const handleBack = useCallback(() => {
+  const performBackNavigation = useCallback(() => {
     if (typeof returnPath === "string" && returnPath.startsWith("/")) {
       navigate(returnPath, { replace: true });
       return;
@@ -410,6 +411,14 @@ export default function LocationMapManager() {
     navigate("/");
   }, [navigate, returnPath]);
 
+  const handleBack = useCallback(() => {
+    if (hasUnsavedChanges && canManage) {
+      setPendingLeave(true);
+      return;
+    }
+    performBackNavigation();
+  }, [canManage, hasUnsavedChanges, performBackNavigation]);
+
   if (!hasLoaded || householdLoading || loading) {
     return (
       <div className="location-map-page">
@@ -522,6 +531,17 @@ export default function LocationMapManager() {
         onClose={() => setPendingDeleteObject(null)}
         onConfirm={handleDeleteObject}
       />
+      <ConfirmSlideModal
+        isOpen={pendingLeave}
+        title="Leave with unsaved changes?"
+        description="Your draft edits are only on this screen right now. Save the draft before leaving if you want to keep them."
+        confirmLabel="Leave Map"
+        onClose={() => setPendingLeave(false)}
+        onConfirm={() => {
+          setPendingLeave(false);
+          performBackNavigation();
+        }}
+      />
     </div>
   );
 }

frontend/tests/location-map-manager.spec.ts

@@ -320,6 +320,11 @@ test("admin creates a map from zones, saves a draft, and publishes it", async ({
   await confirmSlide(page);
   await expect(page.locator(".location-map-object", { hasText: "Temporary Freezer" })).toHaveCount(0);
 
+  await page.getByRole("button", { name: "Back" }).click();
+  await expect(page.getByRole("heading", { name: "Leave with unsaved changes?" })).toBeVisible();
+  await page.getByRole("button", { name: "Cancel" }).click();
+  await expect(page).toHaveURL(/\/stores\/100\/locations\/10\/map$/);
+
   await expect(page.locator(".location-map-status")).toHaveText("Unsaved Draft");
   await page.getByRole("button", { name: "Preview Draft" }).click();
   await expect(page.locator(".location-map-object", { hasText: "Bread Wall" })).toBeVisible();