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/Models/ExerciseModels.swift

@@ -310,6 +310,35 @@ class WorkoutViewModel: ObservableObject {
         sessionStartDate = nil
     }
 
+    // Pull completed workout dates from Apple Health and merge into local streak
+    @MainActor
+    func syncFromHealthKit() async {
+        guard HealthKitManager.shared.authorized else { return }
+        guard let ninetyDaysAgo = Calendar.current.date(byAdding: .day, value: -90, to: Date()) else { return }
+        let hkDates = await HealthKitManager.shared.fetchWorkoutDates(from: ninetyDaysAgo, to: Date())
+        guard !hkDates.isEmpty else { return }
+        var newSet = Set(workoutDates); var updated = false
+        for d in hkDates where !newSet.contains(d) { newSet.insert(d); updated = true }
+        if updated { workoutDates = Array(newSet); save() }
+    }
+
+    // Called on foreground — picks up "Yes I did it" tapped in notification
+    @MainActor
+    func checkPendingHealthConfirm() {
+        let key = "kisani.workout.pendingConfirm"
+        guard let dateStr = UserDefaults.standard.string(forKey: key) else { return }
+        UserDefaults.standard.removeObject(forKey: key)
+        guard !workoutDates.contains(dateStr) else { return }
+        workoutDates.append(dateStr)
+        save()
+        let fmt = DateFormatter(); fmt.dateFormat = "yyyy-MM-dd"
+        if let date = fmt.date(from: dateStr) {
+            let s = Calendar.current.startOfDay(for: date)
+            let e = Calendar.current.date(byAdding: .hour, value: 1, to: s) ?? s
+            Task { await HealthKitManager.shared.saveWorkout(start: s, end: e) }
+        }
+    }
+
     func seedStreak(days: Int) {
         let cal = Calendar.current
         var newDates = Set(workoutDates)