This is so cool I immediately wanted to convert my apps. But then when I thought about it, well it's trying to recreate CSS but in a majorly worse way.
Browsers are ubiquitous and I can just tell ai to build a web page. I can't really see a use case other than novelty.
k9s, ncdu, htop, powertop are good showcases how a TUI reduces mental load and are superior to browsers and / or other GUI tools
If you need a UI over SSH or inside tmux, skipping browsers and CSS isn't just a novelty, it's essential since HTML can't touch that territory. TS-based layout in terminals can be ugly but it also dodges a pile of accessibility, latency and bloat issues you get by default with anything running in Chrome.