Step plates now show "Ramp h:mm:ss" (ramp time only) during ramp phase and "Hold h:mm:ss" (hold remaining) during hold phase, both in the same digit area in green (#4ade80). Inactive steps show planned ramp duration. Header countdown gains a "hold" row alongside the existing "ramp" (renamed from "step") and "total" rows. All three use the same h:mm:ss format. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SH2D4LRuCnhLSzoYerAfJX