fix(w3up-client): authorize agent to use space (#115)

We need to save the space before setting it as the current space,
otherwise the authorization flow will fail because the agent won't be
allowed to use that space.


![image](https://github.com/user-attachments/assets/97dade05-2efd-4e8d-a7a5-103c833d618c)

packages/w3up-client/src/client.js

@@ -329,6 +329,9 @@ export class Client extends Base {
         ]
       }
 
+      // Save the space to authorize the client to use the space
+      await space.save()
+
       for (const serviceConnection of authorizeGatewayServices) {
         await authorizeContentServe(this, space, serviceConnection)
       }