Interval Session Builder

A builder where work duration, recovery, round count, target zone and the warm up and cool down pair are real state with bounded steppers, and the whole session rebuilds live from them: the block list, the total, the preview drawn on a time axis and the planned time in zone all move when a control moves. A computed warning appears when the structure puts more than a tenth of the session in zone five.

粘贴到 Claude Code、Cursor 或 Windsurf 中，它会在你的应用中 1:1 构建这个界面。