It's uncanny, I just vibe built something super similar. A server/client system to share individual windows as a resized app on the phone. I can select certain windows to render as if it was an app on either my Windows client, mac client, or iPhone client from a windows or mac server.

Glad to know I'm not the only one thinking about this. It also connects over tailnet.

Likewise, Glad to have another person thinking on similar tracks!