Why? Part need, part experiment. I'd been using Stretchly and wanted more from it — more configurable scheduling, named profiles, better "don't interrupt me" detection — but I wasn't going to learn its stack to extend it. This is my first developer-wellbeing app, so it doubled as a chance to test a more modern architecture (Rust + Tauri 2 + React) and to see how far Claude and I could get co-developing something where I'm genuinely not the language expert.