feat(weapons) : add conditions and unsaved changes warning

hooks/use-autosave.ts

@@ -134,6 +134,23 @@ export function useAutosave<Value, Draft = Value>({
   else if (fingerprint !== savedFingerprint) state = "unsaved";
   else state = "saved";
 
+  useEffect(() => {
+    const browserWindow = window as Window & { __guideHasUnsavedChanges?: boolean };
+    browserWindow.__guideHasUnsavedChanges = state !== "saved";
+    if (state === "saved") return () => {
+      browserWindow.__guideHasUnsavedChanges = false;
+    };
+    const warnBeforeLeaving = (event: BeforeUnloadEvent) => {
+      event.preventDefault();
+      event.returnValue = "";
+    };
+    window.addEventListener("beforeunload", warnBeforeLeaving);
+    return () => {
+      window.removeEventListener("beforeunload", warnBeforeLeaving);
+      browserWindow.__guideHasUnsavedChanges = false;
+    };
+  }, [state]);
+
   return {
     state,
     saveNow: () => {