Add HIIT watch runner, rest-time setting, and HealthKit watch auto-launch

- Redesign the watch app into an active-workout runner: a root gate shows the
  in-progress workout's exercises or prompts to start one on iPhone, and each
  exercise runs as a horizontally-paged HIIT cycle (count-up work, count-down
  rest with final-three-second haptics + auto-advance, One More / Done on the
  last set). Replaces the old history list.
- Add a configurable rest-between-sets duration in iPhone Settings (default 45s),
  synced to the watch over WatchConnectivity.
- Launch the watch app into the session when a workout starts on the phone via
  HealthKit (startWatchApp); the watch runs an HKWorkoutSession for foreground
  runtime and ends it when the workout finishes. Adds the HealthKit entitlement +
  Health usage strings on both targets and WKBackgroundModes on the watch.

Claude-Session: https://claude.ai/code/session_018gg69MaUetDNzWzBXisfMV
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2026-06-19 16:16:44 -04:00
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@@ -4,6 +4,18 @@ All notable changes to this project are documented here.
## June 2026
- Redesigned the Apple Watch app into a focused workout runner: it opens directly
on the active workout's exercise list (or prompts you to start one on iPhone),
and each exercise runs as a horizontally-paged HIIT cycle — a count-up work
phase, swipe to a count-down rest that pings once per second in the final three
seconds then auto-advances to the next set, and **One More** / **Done** buttons
on the final set.
- Added a configurable rest-between-sets duration (iPhone Settings, default 45s),
synced to the watch over WatchConnectivity.
- Starting a workout on the iPhone now launches the Apple Watch app straight into
the session via HealthKit (a one-time Health permission); the watch holds an
`HKWorkoutSession` to stay active while you train and releases it when the
workout finishes.
- New app icon: a tilted dumbbell on a purple gradient, full-bleed across iOS and
Watch (replaces the teal circular mark).
- **2.0** — Re-platformed persistence onto an iCloud Drive document architecture: