feat: HealthKit workout sync, confirmation notification, health stats on Today dashboard

- HealthKitManager: add fetchWorkoutDates(from:to:) to read past workouts from Apple Health
- WorkoutViewModel: syncFromHealthKit() merges HealthKit workout dates into streak (runs on every foreground); checkPendingHealthConfirm() picks up confirmed workouts from notification action
- NotificationManager: WORKOUT_CONFIRM category with 'Yes, log it' action; scheduleWorkoutConfirm() fires weekly on scheduled workout days at configurable time (default 8pm); LOG_WORKOUT action writes pendingConfirm to UserDefaults
- SettingsView (Workout Settings): new HEALTH SYNC section with 'Sync now' button and 'Workout confirmation reminder' toggle + time picker
- TodayView: TodayHealthStrip shows steps, active calories, resting HR, and workout streak in a 4-pill row below the date header (only shown when HealthKit is authorized); refreshes on appear and foreground
- FAB: Matrix FAB padding fixed to match Today/Calendar position (.bottom 10)

Co-Authored-By: Kutesir <tqwyy79vzn@privaterelay.appleid.com>

KisaniCal/ContentView.swift

@@ -91,8 +91,10 @@ struct ContentView: View {
         .onChange(of: scenePhase) { phase in
             if phase == .active {
                 taskVM.reload()
+                workoutVM.checkPendingHealthConfirm()
                 CloudSyncManager.shared.backupSettings()
                 NotificationManager.shared.reschedule(workoutVM: workoutVM, taskVM: taskVM)
+                Task { await workoutVM.syncFromHealthKit() }
             }
         }
         .onChange(of: taskVM.tasks) { _ in