Workout check-in: missed state + rest-day compensation (KC-16)

- Notification actions on workout reminders/check-ins: "Yes, I completed
  it", "No, I didn't" (marks the day missed, then asks to compensate on a
  rest day), "Remind me in 1 hour" (snooze).
- VM: missedDates + compensations (persisted/synced), per-date
  markWorkoutDone/Missed, workoutStatus, upcomingRestDays,
  scheduleCompensation, promptCompensation, checkPendingMissed.
  program(for:) returns a compensation program on its rest day.
- CompensationSheet: pick a rest day or keep as missed; compensation days
  get a one-off "Missed workout recovery" reminder.
- Long-press menus: workout row (Done / Not Done / Compensate) in Today +
  Calendar; exercise cards (Mark as Done / Not Done). All actions are
  per-date — one occurrence never affects another.
- Workout row shows Pending / Done / Missed + "Compensation" label.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

KisaniCal/ContentView.swift

@@ -94,6 +94,7 @@ struct ContentView: View {
         .onAppear {
             if !hasOnboarded { showOnboarding = true }
             workoutVM.resetSetsForNewDayIfNeeded()
+            workoutVM.checkPendingMissed()
             CloudSyncManager.shared.restoreSettings()
             CloudSyncManager.shared.backupSettings()
             HealthKitManager.shared.bootstrap()
@@ -111,6 +112,7 @@ struct ContentView: View {
                 consumeWidgetAddTask()
                 workoutVM.resetSetsForNewDayIfNeeded()
                 workoutVM.checkPendingHealthConfirm()
+                workoutVM.checkPendingMissed()
                 CloudSyncManager.shared.backupSettings()
                 NotificationManager.shared.reschedule(workoutVM: workoutVM, taskVM: taskVM)
                 Task {
@@ -123,6 +125,12 @@ struct ContentView: View {
             NotificationManager.shared.reschedule(workoutVM: workoutVM, taskVM: taskVM)
             WidgetCenter.shared.reloadAllTimelines()
         }
+        .sheet(item: $workoutVM.askCompensate) { missed in
+            CompensationSheet(missed: missed)
+                .environmentObject(workoutVM)
+                .presentationDetents([.medium, .large])
+                .presentationDragIndicator(.visible)
+        }
         .onChange(of: workoutVM.doneSets) { _ in
             NotificationManager.shared.reschedule(workoutVM: workoutVM, taskVM: taskVM)
         }