Now, the fun part: how it was made. I ran Claude Code + Flowstep together over MCP. First, I wrote out a spec of everything the product needed to do and handed it to the setup. Then I went through the existing tool and documented its design system - this turned out to be the smartest thing I did, because it kept every screen consistent instead of feeling like ten different products. After that, I generated prompts in Flowstep, one dedicated prompt per user flow. I refined each screen with prompts, and honestly, most of the time it landed on the first or second try. The few tiny things left over I just nudged by hand right in Flowstep.