fix: potential race condition on app load when migration (#2977)

Co-authored-by: Alex Yang <himself65@outlook.com>

apps/web/src/bootstrap/index.ts

@@ -129,16 +129,10 @@ if (environment.isBrowser) {
         })
         .finally(() => {
           window.dispatchEvent(new CustomEvent('migration-done'));
+          window.$migrationDone = true;
         });
     } catch (e) {
       console.error('error when migrating data', e);
     }
   }
 }
-
-declare global {
-  // global Events
-  interface WindowEventMap {
-    'migration-done': CustomEvent;
-  }
-}