Workout tab.
The Workout tab shows the session HGB thinks is next. If no program is stored, the screen shows setup instructions and an Open Settings button.
- Priority order: in-progress → paused → next not-started → most recent completed.
- Black background with a lime accent; the lime button is the primary action for the current step.
- Header shows week, session number, current phase, and — once started — an elapsed workout timer.