feat: Dynamic Island pause state, Apple-aligned spacing, and UI polish

- Add isPaused to WorkoutActivityAttributes.ContentState
- Show PAUSED badge, freeze timer to static text, dim content when paused
- Prevent stale spinner on pause by extending staleDate to 1 hour
- Add 6s timer warning color, progress bar, compact heavy timer
- Pulsing compact indicator during WORK phase
- Lock Screen margins aligned to Apple's 14pt HIG spec

tabatago-swift/TabataGo/ViewModels/PlayerViewModel.swift

@@ -152,6 +152,7 @@ final class PlayerViewModel: ObservableObject {
         timer?.invalidate()
         stopActivitySyncTimer()
         liveSession.pause()
+        syncActivity()
         softHaptics.impactOccurred()
     }
 
@@ -380,7 +381,8 @@ final class PlayerViewModel: ObservableObject {
             heartRate: heartRate,
             trackTitle: currentTrackTitle,
             trackArtist: currentTrackArtist,
-            isPlaying: isPlayingMusic
+            isPlaying: isPlayingMusic,
+            isPaused: isPaused
         )
 
         // Discard stale reference — user may have dismissed the Dynamic Island
@@ -390,8 +392,9 @@ final class PlayerViewModel: ObservableObject {
 
         if let existing = workoutActivity {
             nonisolated(unsafe) let safeExisting = existing
+            let staleDate = Date().addingTimeInterval(isPaused ? 3600 : 120)
             Task { @MainActor in
-                await safeExisting.update(ActivityContent(state: state, staleDate: Date().addingTimeInterval(120)))
+                await safeExisting.update(ActivityContent(state: state, staleDate: staleDate))
             }
         } else {
             createOrUpdateActivity(with: state)
@@ -401,9 +404,10 @@ final class PlayerViewModel: ObservableObject {
     private func createOrUpdateActivity(with state: WorkoutActivityAttributes.ContentState) {
         let attrs = WorkoutActivityAttributes()
         do {
+            let staleDate = Date().addingTimeInterval(isPaused ? 3600 : 120)
             workoutActivity = try Activity.request(
                 attributes: attrs,
-                content: ActivityContent(state: state, staleDate: Date().addingTimeInterval(120))
+                content: ActivityContent(state: state, staleDate: staleDate)
             )
             observeActivityState()
         } catch {
@@ -427,7 +431,8 @@ final class PlayerViewModel: ObservableObject {
             heartRate: safeActivity.content.state.heartRate,
             trackTitle: safeActivity.content.state.trackTitle,
             trackArtist: safeActivity.content.state.trackArtist,
-            isPlaying: false
+            isPlaying: false,
+            isPaused: false
         )
         await safeActivity.end(ActivityContent(state: finalState, staleDate: nil), dismissalPolicy: .immediate)
     }