- Replace raw string phase model with WorkoutPhase enum (Codable, Sendable, CaseIterable)
with built-in .capitalized display name and SwiftUI .color per phase
- Decompose WorkoutLiveActivity into reusable view structs: PhasePill, CountdownText,
WorkoutProgressBar, MusicInfoRow, HeartRateBadge, PhaseIndicatorDot, WorkoutLockScreenView,
WorkoutSmallView — following CraftingSwift iOS 26 architecture patterns
- Add AlertConfiguration on work/rest/complete phase transitions so Dynamic Island
expands and lights up at key moments
- Add 13 #Preview blocks across both widgets covering all presentation types:
lock screen, expanded, compact, minimal — for instant Xcode Canvas feedback
- Add stale state handling (context.isStale shows 'Last updated' indicator)
- MusicLiveActivity: 5 new #Preview blocks for playing/paused/expanded/compact/minimal
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