feat: add focus workout view

[giulioleuci]

Closes #221

Implements the Focus workout view — a fourth, purely presentational layout for the active workout screen, one set at a time.

What this adds

• One set at a time: a large card with the exercise, its preset target (reps / load / RPE / rest / tempo) and big tactile steppers for load (uses the exercise's increment) and reps.
• Complete / Skip / pager: a full-width Complete button routed through the existing toggle path — sound, haptics, rest timer, progression, high-water protection all shared with the other layouts; Skip advances without completing; a footer pager (chevrons + one dot per set) navigates directly.
• Supersets: round-by-round flow (A1 → B1 → A2 → B2), one member at a time, with round indicator and in-superset chevrons.
• Special set types: warm-up, drop-sets, bursts, timed sets, and unilateral L/R sets keep their existing behaviour.
• Locking: editing a set is disabled until every earlier set in the exercise is complete; finishing the last set auto-advances to the next unfinished exercise.
• Settings & persistence: "Focus" added to the Settings → Workout view Segmented and to the header ⋮ layout menu; the choice snapshots onto s.active.workoutView and falls back to cards for unknown values.

Not in scope

• No changes to persisted model, finished-workout data or progression rules — the layout is pure presentation over the existing s.active session.
• Stepper / Slider gained optional disabled / onStep / ariaLabel props to power the focus card; all existing layouts render as before.

Tests

• New workout focus view describe block in Workout.test.jsx (focus rendering, set navigation, completion auto-advance, superset round flow, unilateral sets).
• Updated Settings.workoutview.test.jsx, sheets.workoutview.test.jsx, ui.test.jsx for the 4-way control and the new Stepper/Slider props.
• Full suite green: 1392 tests passed.

[giulioleuci]

Implement #221

[kurktchiev]

Do you have screenshots of what this looks like?

[giulioleuci]

I added two images to the PR message. In my app, I only have this view because it works well for me. https://github.com/giulioleuci/test-app-workout-alpha

[kurktchiev]

How does this work with timed exercises?

[giulioleuci]

I have updated the screenshots in the PR to visually demonstrate this UI behavior.

In the Focus view for timed sets (mode === 'time'), the interface presents the user with their target hold time (e.g., "45s hold") and a dedicated Start button rather than the standard repetition stepper.

Tapping Start triggers an interactive on-screen countdown timer. Once the timer completes—or if the user stops it early—the app automatically captures and logs the exact duration held (for instance, recording 38 seconds if stopped early instead of the target 45 seconds). Upon logging, a brief "Hold logged" notification appears, and the app smoothly transitions into the standard post-set routine, whether that means initiating the rest timer, advancing to the next exercise in a superset, or prompting workout completion.

Ultimately, timed sets fit right into the existing completion workflow; they simply replace manual rep logging with a guided countdown experience.

[DuarteSantos8]

Thanks @giulioleuci, and for the screenshots. A focus view makes sense to me. It wasn't in v1.3.9 because the workout screen changed a lot in this release (plan line, keyboard shortcuts, rest pause, per-exercise "Don't count for progression", swipe preview, plate lines), so it needs a rebase onto v1.3.9.

For the next round: every new string in all locale packs (the check fails otherwise), no docs/superpowers spec in the repo, and keyboard Space/Enter should behave the same as in the other views.

[giulioleuci]

Hi @DuarteSantos8 ,

• I rebased (but I don't upload the new images).
• I added the new translation strings (translated by OpenCode Zen).
• I deleted the superpowers files.

[DuarteSantos8]

Merged into v1.4.0, thanks @giulioleuci!