fixing imports and ssr support + updated remix/nextjs/astro examples

app/src/ui/client/index.ts

@@ -1,5 +1,10 @@
-export { ClientProvider, type ClientProviderProps, useClient, useBaseUrl } from "./ClientProvider";
-export { BkndProvider, useBknd } from "./BkndProvider";
+export {
+   ClientProvider,
+   useBkndWindowContext,
+   type ClientProviderProps,
+   useClient,
+   useBaseUrl
+} from "./ClientProvider";
 
 export { useAuth } from "./schema/auth/use-auth";
 export { Api } from "../../Api";