apps/workout: redesign selection, tracking and heart rate history

[gmarull]

Workout now opens on a Run / Walk / Workout picker and carries the selected activity’s color, name and icon through tracking and completion. The redesign uses native Pebble fonts and resources, with colors drawn from Weather.

• Horizontal icon transitions and selection markers; a short icon exit, pulsing 3–2–1 countdown, and circle-to-header transition. Back or a right swipe cancels the countdown.
• Elapsed time, average cadence, average speed and HR pages, with distance, pace, steps, estimated active calories and average HR where applicable. Active values update once per second.
• Touch and button navigation, a Select half-ball indicator, and touchable sidebars for pause/resume and end confirmation. Completion preserves a browsable recap.
• On the HR page, swipe up or press Down for the last minute’s history. The plot uses rounded automatic min/max bounds, equal side margins and gaps for missing readings. Swipe down or press Up returns to zones; left/right continues switching metric pages. Pausing freezes history and completion retains it.

Recording

Captioned MP4 (3:16) · Chapters and native PNGs

Full native-screen recording (GIF)

The edited walkthrough covers all three activity types, countdown cancellation/start, metric navigation, HR history, pause/resume, cancelling the end prompt, confirmation and recap. Captions identify touch and button inputs. Captured in QEMU with synthetic service data; the production firmware uses the existing workout service.

Screenshots

Validation

• Firmware builds: qemu_emery (color) and qemu_flint (monochrome).
• All nine focused CTest entries pass: workout active/summary/selection on rectangular and round platforms, workout utilities, workout service, and their render-fixture setup.
• Tests cover derived metrics, absent/invalid readings, finish handling, HR ring rollover, duplicate samples, timestamp reset, missing/stale data and autoscaling. Updated native render fixtures include the dashboard, recap and HR charts.
• QEMU walkthrough verified using monitor button events and QMP touch input. Physical watch testing remains for review.
• Both commits pass gitlint and include DCO sign-offs and GPT-6 co-author attribution.

Based on current main; the PR #2027 emulator-feed commits used during development are not included in this diff.

Review polish still needed: Open workout pause/end screens use the distance field, and cadence/Open recaps repeat estimated calories.

[ericmigi]

JP feedback: colourful, white
Alice: bar graph animation, heart beating animation, a little bit more character