Finally fixed: added explicit cancellation checks, need to verify by independent testers

DynamicIsland/DynamicIslandApp.swift

@@ -398,6 +398,8 @@ class AppDelegate: NSObject, NSApplicationDelegate {
             self?.debouncedUpdateWindowSize()
         }.store(in: &cancellables)
 
+        MemoryUsageMonitor.shared.startMonitoring()
+
         ReminderLiveActivityManager.shared.$activeWindowReminders
             .receive(on: RunLoop.main)
             .sink { [weak self] _ in

DynamicIsland/managers/CalendarManager.swift

@@ -29,6 +29,12 @@ class CalendarManager: ObservableObject {
     private var lastEventsFetchDate: Date?
     private let reloadRefreshInterval: TimeInterval = 15
     private var eventStoreChangedObserver: NSObjectProtocol?
+    private var pendingEventStoreRefreshTask: Task<Void, Never>?
+    private var nextAllowedEventStoreRefresh: Date = .distantPast
+    private var ignoreEventStoreChangesUntil: Date = .distantPast
+    private let eventStoreChangeThrottle: TimeInterval = 20
+    private let selfInducedChangeSuppression: TimeInterval = 6
+    private let eventFetchLimiter = EventFetchLimiter()
 
     var hasCalendarAccess: Bool { isAuthorized(calendarAuthorizationStatus) }
     var hasReminderAccess: Bool { isAuthorized(reminderAuthorizationStatus) }
@@ -45,6 +51,7 @@ class CalendarManager: ObservableObject {
         if let observer = eventStoreChangedObserver {
             NotificationCenter.default.removeObserver(observer)
         }
+        pendingEventStoreRefreshTask?.cancel()
     }
 
     private func setupEventStoreChangedObserver() {
@@ -53,14 +60,46 @@ class CalendarManager: ObservableObject {
             object: nil,
             queue: .main
         ) { [weak self] _ in
-            Task {
+            self?.handleEventStoreChanged()
-                guard let self else { return }
-                await self.reloadCalendarAndReminderLists()
-                await self.maybeRefreshEventsAfterReload()
-            }
         }
     }
 
+    private func handleEventStoreChanged() {
+        Logger.log("CalendarManager: Event store changed notification received", category: .lifecycle)
+        let now = Date()
+        guard now >= ignoreEventStoreChangesUntil else { return }
+
+        if now < nextAllowedEventStoreRefresh {
+            let delay = max(nextAllowedEventStoreRefresh.timeIntervalSince(now), 0.05)
+            scheduleEventStoreRefresh(after: delay)
+            return
+        }
+
+        nextAllowedEventStoreRefresh = now.addingTimeInterval(eventStoreChangeThrottle)
+        scheduleEventStoreRefresh(after: 0)
+    }
+
+    private func scheduleEventStoreRefresh(after delay: TimeInterval) {
+        pendingEventStoreRefreshTask?.cancel()
+        pendingEventStoreRefreshTask = Task { [weak self] in
+            guard let self else { return }
+            if delay > 0 {
+                let nanoseconds = UInt64(delay * 1_000_000_000)
+                try? await Task.sleep(nanoseconds: nanoseconds)
+            }
+            await self.performEventStoreRefresh()
+        }
+    }
+
+    @MainActor
+    private func performEventStoreRefresh() async {
+        pendingEventStoreRefreshTask = nil
+        await reloadCalendarAndReminderLists()
+        await maybeRefreshEventsAfterReload()
+        nextAllowedEventStoreRefresh = Date().addingTimeInterval(eventStoreChangeThrottle)
+        ignoreEventStoreChangesUntil = Date().addingTimeInterval(selfInducedChangeSuppression)
+    }
+
     @MainActor
     func reloadCalendarAndReminderLists() async {
         let allCalendars = await calendarService.calendars()
@@ -99,13 +138,13 @@ class CalendarManager: ObservableObject {
             calendarAuthorizationStatus = granted ? .fullAccess : .denied
             if granted {
                 await reloadCalendarAndReminderLists()
-                await updateEvents()
+                await updateEvents(force: true)
             }
         case .restricted, .denied:
             NSLog("Calendar access denied or restricted")
         case .authorized, .fullAccess:
             await reloadCalendarAndReminderLists()
-            await updateEvents()
+            await updateEvents(force: true)
         case .writeOnly:
             NSLog("Calendar write only")
         @unknown default:
@@ -175,7 +214,7 @@ class CalendarManager: ObservableObject {
 
         Defaults[.calendarSelectionState] = selectionState
         updateSelectedCalendars()
-        await updateEvents()
+        await updateEvents(force: true)
     }
 
     static func startOfDay(_ date: Date) -> Date {
@@ -184,22 +223,70 @@ class CalendarManager: ObservableObject {
 
     func updateCurrentDate(_ date: Date) async {
         currentWeekStartDate = Calendar.current.startOfDay(for: date)
-        await updateEvents()
+        await updateEvents(force: true)
     }
 
-    private func updateEvents() async {
+    private func updateEvents(force: Bool = false) async {
+        let now = Date()
+        if !force, let lastFetch = lastEventsFetchDate, now.timeIntervalSince(lastFetch) < reloadRefreshInterval {
+            return
+        }
+        
+        Logger.log("CalendarManager: Updating events (force: \(force))", category: .lifecycle)
+
         let calendarIDs = selectedCalendars.map { $0.id }
-        let events = await calendarService.events(
+        let startDate = currentWeekStartDate
-            from: currentWeekStartDate,
+        guard let endDate = Calendar.current.date(byAdding: .day, value: 1, to: currentWeekStartDate) else { return }
-            to: Calendar.current.date(byAdding: .day, value: 1, to: currentWeekStartDate)!,
+        let service = calendarService
-            calendars: calendarIDs
+
-        )
+        let events = await eventFetchLimiter.run {
+            await service.events(
+                from: startDate,
+                to: endDate,
+                calendars: calendarIDs
+            )
+        }
+
         self.events = events
         lastEventsFetchDate = Date()
     }
 
     func setReminderCompleted(reminderID: String, completed: Bool) async {
         await calendarService.setReminderCompleted(reminderID: reminderID, completed: completed)
-        await updateEvents()
+        await updateEvents(force: true)
+    }
+}
+
+// MARK: - Event Fetch Limiter
+
+private actor EventFetchLimiter {
+    private var waiters: [CheckedContinuation<Void, Never>] = []
+    private var isRunning = false
+
+    func run<T>(_ operation: @escaping @Sendable () async -> T) async -> T {
+        await waitTurn()
+        defer { resumeNext() }
+        return await operation()
+    }
+
+    private func waitTurn() async {
+        if !isRunning {
+            isRunning = true
+            return
+        }
+
+        await withCheckedContinuation { continuation in
+            waiters.append(continuation)
+        }
+    }
+
+    private func resumeNext() {
+        if waiters.isEmpty {
+            isRunning = false
+            return
+        }
+
+        let continuation = waiters.removeFirst()
+        continuation.resume()
     }
 }

DynamicIsland/managers/LockScreenManager.swift

@@ -80,7 +80,12 @@ class LockScreenManager: ObservableObject {
     // MARK: - Event Handlers
     
     @objc private func screenLocked() {
+        guard !isLocked else {
+            print("[\(timestamp())] LockScreenManager: 🔁 Duplicate LOCK event ignored")
+            return
+        }
         print("[\(timestamp())] LockScreenManager: 🔒 Screen LOCKED event received")
+        Logger.log("LockScreenManager: Screen locked", category: .lifecycle)
         LockSoundPlayer.shared.playLockChime()
         
         // Update state SYNCHRONOUSLY without Task/await to avoid any delay
@@ -107,7 +112,6 @@ class LockScreenManager: ObservableObject {
         LockScreenPanelManager.shared.showPanel()
         LockScreenLiveActivityWindowManager.shared.showLocked()
         LockScreenWeatherManager.shared.showWeatherWidget()
-        LockScreenReminderWidgetManager.shared.showReminderWidget()
         LockScreenTimerWidgetManager.shared.handleLockStateChange(isLocked: true)
         TimerControlWindowManager.shared.hide(animated: false)
         
@@ -123,15 +127,22 @@ class LockScreenManager: ObservableObject {
     }
     
     @objc private func screenUnlocked() {
+        guard isLocked else {
+            print("[\(timestamp())] LockScreenManager: 🔁 Unlock event ignored (already unlocked)")
+            return
+        }
         print("[\(timestamp())] LockScreenManager: 🔓 Screen UNLOCKED event received")
+        Logger.log("LockScreenManager: Screen unlocked", category: .lifecycle)
         LockSoundPlayer.shared.playUnlockChime()
+        lastUpdated = Date()
+        updateIdleState(locked: false)
+        isLocked = false
         
         // Hide panel window immediately and synchronously
         print("[\(timestamp())] LockScreenManager: 🚪 Hiding panel window")
         LockScreenPanelManager.shared.hidePanel()
         LockScreenLiveActivityWindowManager.shared.showUnlockAndScheduleHide()
         LockScreenWeatherManager.shared.hideWeatherWidget()
-        LockScreenReminderWidgetManager.shared.hideReminderWidget()
         LockScreenTimerWidgetManager.shared.handleLockStateChange(isLocked: false)
         
         // Update state immediately
@@ -146,10 +157,6 @@ class LockScreenManager: ObservableObject {
             }
         }
         
-        self.lastUpdated = Date()
-    self.updateIdleState(locked: false)
-        self.isLocked = false
-        
         print("[\(self.timestamp())] LockScreenManager: ✅ Lock screen deactivated")
     }
     

DynamicIsland/managers/LockScreenReminderWidgetManager.swift

@@ -1,8 +1,6 @@
 import Foundation
 import Combine
 import Defaults
-import SwiftUI
-import AppKit
 
 @MainActor
 final class LockScreenReminderWidgetManager: ObservableObject {
@@ -13,65 +11,58 @@ final class LockScreenReminderWidgetManager: ObservableObject {
     private let reminderManager = ReminderLiveActivityManager.shared
     private var cancellables = Set<AnyCancellable>()
 
-    private let timeFormatter: DateFormatter = {
-        let formatter = DateFormatter()
-        formatter.dateStyle = .none
-        formatter.timeStyle = .short
-        return formatter
-    }()
-
     private init() {
-        observeReminderUpdates()
         observeDefaults()
+        observeLockState()
+        observeReminderSnapshots()
     }
 
-    func showReminderWidget() {
+    private func observeLockState() {
+        LockScreenManager.shared.$isLocked
+            .removeDuplicates()
+            .receive(on: RunLoop.main)
+            .sink { [weak self] locked in
+                self?.handleLockStateChange(isLocked: locked)
+            }
+            .store(in: &cancellables)
+    }
+
+    private func observeReminderSnapshots() {
+        reminderManager.$lockScreenSnapshot
+            .receive(on: RunLoop.main)
+            .sink { [weak self] snapshot in
+                self?.handleSnapshotUpdate(snapshot)
+            }
+            .store(in: &cancellables)
+    }
+
+    private func handleLockStateChange(isLocked: Bool) {
+        Logger.log("LockScreenReminderWidgetManager: handleLockStateChange(isLocked: \(isLocked))", category: .lifecycle)
         guard Defaults[.enableLockScreenReminderWidget] else {
             LockScreenReminderWidgetPanelManager.shared.hide()
             return
         }
 
-        if let snapshot {
+        if isLocked {
-            LockScreenReminderWidgetPanelManager.shared.show(with: snapshot)
+            if let latest = reminderManager.lockScreenSnapshot ?? snapshot {
-        } else {
+                snapshot = latest
-            recomputeSnapshot(now: reminderManager.currentDate)
+                LockScreenReminderWidgetPanelManager.shared.show(with: latest)
-            if let snapshot {
-                LockScreenReminderWidgetPanelManager.shared.show(with: snapshot)
             } else {
                 LockScreenReminderWidgetPanelManager.shared.hide()
             }
+        } else {
+            LockScreenReminderWidgetPanelManager.shared.hide()
         }
     }
 
-    func hideReminderWidget() {
-        LockScreenReminderWidgetPanelManager.shared.hide()
-    }
-
-    private func observeReminderUpdates() {
-        reminderManager.$activeReminder
-            .receive(on: RunLoop.main)
-            .sink { [weak self] _ in
-                guard let self else { return }
-                self.recomputeSnapshot(now: self.reminderManager.currentDate)
-            }
-            .store(in: &cancellables)
-
-        reminderManager.$currentDate
-            .receive(on: RunLoop.main)
-            .sink { [weak self] now in
-                guard let self else { return }
-                self.recomputeSnapshot(now: now)
-            }
-            .store(in: &cancellables)
-    }
-
     private func observeDefaults() {
         Defaults.publisher(.enableLockScreenReminderWidget, options: [])
             .sink { [weak self] change in
                 guard let self else { return }
                 if change.newValue {
-                    self.recomputeSnapshot(now: self.reminderManager.currentDate)
+                    if LockScreenManager.shared.currentLockStatus {
-                    self.showReminderWidgetIfPossible()
+                        self.handleSnapshotUpdate(self.reminderManager.lockScreenSnapshot)
+                    }
                 } else {
                     self.snapshot = nil
                     LockScreenReminderWidgetPanelManager.shared.hide()
@@ -82,128 +73,29 @@ final class LockScreenReminderWidgetManager: ObservableObject {
         Defaults.publisher(.lockScreenReminderChipStyle, options: [])
             .sink { [weak self] _ in
                 guard let self else { return }
-                self.recomputeSnapshot(now: self.reminderManager.currentDate)
+                self.handleSnapshotUpdate(self.reminderManager.lockScreenSnapshot)
             }
             .store(in: &cancellables)
     }
 
-    private func showReminderWidgetIfPossible() {
+    private func handleSnapshotUpdate(_ newSnapshot: LockScreenReminderWidgetSnapshot?) {
-        guard LockScreenManager.shared.currentLockStatus else { return }
-        guard Defaults[.enableLockScreenReminderWidget] else { return }
-        if let snapshot {
-            LockScreenReminderWidgetPanelManager.shared.show(with: snapshot)
-        } else {
-            LockScreenReminderWidgetPanelManager.shared.hide()
-        }
-    }
-
-    private func recomputeSnapshot(now: Date) {
         guard Defaults[.enableLockScreenReminderWidget] else {
             snapshot = nil
             LockScreenReminderWidgetPanelManager.shared.hide()
             return
         }
 
-        guard let entry = reminderManager.activeReminder else {
+        snapshot = newSnapshot
-            snapshot = nil
-            LockScreenReminderWidgetPanelManager.shared.hide()
-            return
-        }
 
-        let snapshot = makeSnapshot(from: entry, now: now)
-        if self.snapshot != snapshot {
-            self.snapshot = snapshot
-        }
-        deliver(snapshot)
-    }
-
-    private func deliver(_ snapshot: LockScreenReminderWidgetSnapshot) {
         guard LockScreenManager.shared.currentLockStatus else { return }
-        if LockScreenReminderWidgetPanelManager.shared.isVisible {
+
-            LockScreenReminderWidgetPanelManager.shared.update(with: snapshot)
+        if let newSnapshot {
+            Logger.log("LockScreenReminderWidgetManager: Updating snapshot on lock screen", category: .ui)
+            LockScreenReminderWidgetPanelManager.shared.show(with: newSnapshot)
         } else {
-            LockScreenReminderWidgetPanelManager.shared.show(with: snapshot)
+            LockScreenReminderWidgetPanelManager.shared.hide()
         }
     }
 
-    private func makeSnapshot(from entry: ReminderLiveActivityManager.ReminderEntry, now: Date) -> LockScreenReminderWidgetSnapshot {
-        let title = entry.event.title.isEmpty ? "Upcoming Reminder" : entry.event.title
-        let timeText = timeFormatter.string(from: entry.event.start)
-        let isCritical = criticalWindowContains(entry: entry, now: now)
-        let relative = relativeDescription(for: entry, now: now)
-        let accent = accentColor(for: entry, isCritical: isCritical)
-        let iconName = isCritical ? ReminderLiveActivityManager.criticalIconName : ReminderLiveActivityManager.standardIconName
-
-        return LockScreenReminderWidgetSnapshot(
-            title: title,
-            eventTimeText: timeText,
-            relativeDescription: relative,
-            accent: accent,
-            chipStyle: Defaults[.lockScreenReminderChipStyle],
-            isCritical: isCritical,
-            iconName: iconName
-        )
-    }
-
-    private func accentColor(for entry: ReminderLiveActivityManager.ReminderEntry, isCritical: Bool) -> LockScreenReminderWidgetSnapshot.RGBAColor {
-        if isCritical {
-            return LockScreenReminderWidgetSnapshot.RGBAColor(nsColor: .systemRed)
-        }
-
-        let boosted = Color(nsColor: entry.event.calendar.color).ensureMinimumBrightness(factor: 0.7)
-        return LockScreenReminderWidgetSnapshot.RGBAColor(nsColor: NSColor(boosted))
-    }
-
-    private func relativeDescription(for entry: ReminderLiveActivityManager.ReminderEntry, now: Date) -> String? {
-        let remaining = entry.event.start.timeIntervalSince(now)
-        if remaining <= 0 {
-            return "now"
-        }
-
-        let minutes = Int(ceil(remaining / 60))
-        if minutes <= 0 {
-            return "now"
-        }
-        if minutes == 1 {
-            return "in 1 min"
-        }
-        return "in \(minutes) min"
-    }
-
-    private func criticalWindowContains(entry: ReminderLiveActivityManager.ReminderEntry, now: Date) -> Bool {
-        let window = TimeInterval(Defaults[.reminderSneakPeekDuration])
-        guard window > 0 else { return false }
-        let remaining = entry.event.start.timeIntervalSince(now)
-        return remaining > 0 && remaining <= window
-    }
-}
-
-struct LockScreenReminderWidgetSnapshot: Equatable {
-    struct RGBAColor: Equatable {
-        let red: Double
-        let green: Double
-        let blue: Double
-        let alpha: Double
-
-        init(nsColor: NSColor) {
-            let color = nsColor.usingColorSpace(.sRGB) ?? nsColor
-            self.red = Double(color.redComponent)
-            self.green = Double(color.greenComponent)
-            self.blue = Double(color.blueComponent)
-            self.alpha = Double(color.alphaComponent)
-        }
-
-        var color: Color {
-            Color(red: red, green: green, blue: blue, opacity: alpha)
-        }
-    }
-
-    let title: String
-    let eventTimeText: String
-    let relativeDescription: String?
-    let accent: RGBAColor
-    let chipStyle: LockScreenReminderChipStyle
-    let isCritical: Bool
-    let iconName: String
 }
 

DynamicIsland/managers/MemoryUsageMonitor.swift

@@ -0,0 +1,110 @@
+import AppKit
+import Foundation
+import Darwin
+
+@MainActor
+final class MemoryUsageMonitor {
+    static let shared = MemoryUsageMonitor()
+
+    private let thresholdBytes: UInt64 = 300 * 1_024 * 1_024
+    private let pollInterval: TimeInterval = 8 // Clamp within 5-10 seconds to limit battery impact
+    private let restartCooldown: TimeInterval = 300
+    private let logSampleInterval: TimeInterval = 300
+    private var monitorTask: Task<Void, Never>?
+    private var lastRestartAttempt: Date = .distantPast
+    private var lastLogSample: Date = .distantPast
+
+    func startMonitoring() {
+        guard monitorTask == nil else { return }
+        monitorTask = Task { [weak self] in
+            guard let self else { return }
+            while !Task.isCancelled {
+                await self.evaluateMemoryFootprint()
+                do {
+                    try await Task.sleep(for: .seconds(self.pollInterval))
+                } catch {
+                    break
+                }
+            }
+        }
+    }
+
+    func stopMonitoring() {
+        monitorTask?.cancel()
+        monitorTask = nil
+    }
+
+    private func evaluateMemoryFootprint() async {
+        guard let usage = currentResidentSize() else { return }
+        if usage >= thresholdBytes {
+            restartIfNeeded(currentUsage: usage)
+        } else if Date().timeIntervalSince(lastLogSample) >= logSampleInterval {
+            lastLogSample = Date()
+            Logger.log("[MemoryMonitor] Resident usage: \(formatMegabytes(usage)) MB", category: .memory)
+        }
+    }
+
+    private func restartIfNeeded(currentUsage: UInt64) {
+        let now = Date()
+        guard now.timeIntervalSince(lastRestartAttempt) >= restartCooldown else {
+            Logger.log("[MemoryMonitor] Usage \(formatMegabytes(currentUsage)) MB exceeds threshold but cooldown active", category: .warning)
+            return
+        }
+        lastRestartAttempt = now
+        Logger.log("[MemoryMonitor] Usage \(formatMegabytes(currentUsage)) MB >= \(formatMegabytes(thresholdBytes)) MB. Prompting for restart.", category: .warning)
+        presentRestartAlert(currentUsage: currentUsage)
+    }
+
+    private func presentRestartAlert(currentUsage: UInt64) {
+        let alert = NSAlert()
+        alert.alertStyle = .warning
+        alert.messageText = "DynamicIsland memory usage is high"
+        alert.informativeText = "The app is currently using \(formatMegabytes(currentUsage)) MB, which exceeds the safe limit of \(formatMegabytes(thresholdBytes)) MB. Restart now to free memory?"
+        alert.addButton(withTitle: "Restart Now")
+        alert.addButton(withTitle: "Later")
+
+        let response = alert.runModal()
+        if response == .alertFirstButtonReturn {
+            relaunchApplication()
+        } else {
+            Logger.log("[MemoryMonitor] Restart postponed by user", category: .warning)
+        }
+    }
+
+    private func relaunchApplication() {
+        let workspace = NSWorkspace.shared
+        let configuration = NSWorkspace.OpenConfiguration()
+        configuration.createsNewApplicationInstance = true
+
+        let appURL = workspace.urlForApplication(withBundleIdentifier: Bundle.main.bundleIdentifier ?? "") ?? Bundle.main.bundleURL
+
+        workspace.openApplication(at: appURL, configuration: configuration) { _, error in
+            if let error {
+                Logger.log("[MemoryMonitor] Failed to launch replacement app: \(error.localizedDescription)", category: .error)
+            }
+            Task { @MainActor in
+                NSApplication.shared.terminate(nil)
+            }
+        }
+    }
+
+    private func currentResidentSize() -> UInt64? {
+        var info = mach_task_basic_info()
+        var count = mach_msg_type_number_t(MemoryLayout<mach_task_basic_info>.size) / 4
+        let result = withUnsafeMutablePointer(to: &info) {
+            $0.withMemoryRebound(to: integer_t.self, capacity: Int(count)) {
+                task_info(mach_task_self_, task_flavor_t(MACH_TASK_BASIC_INFO), $0, &count)
+            }
+        }
+        guard result == KERN_SUCCESS else {
+            Logger.log("[MemoryMonitor] task_info failed with code \(result)", category: .error)
+            return nil
+        }
+        return UInt64(info.resident_size)
+    }
+
+    private func formatMegabytes(_ bytes: UInt64) -> String {
+        let mb = Double(bytes) / 1_048_576.0
+        return String(format: "%.1f", mb)
+    }
+}

DynamicIsland/managers/ReminderLiveActivityManager.swift

@@ -9,6 +9,8 @@ import Combine
 import Defaults
 import Foundation
 import CoreGraphics
+import SwiftUI
+import AppKit
 import os
 
 @MainActor
@@ -32,6 +34,7 @@ final class ReminderLiveActivityManager: ObservableObject {
     @Published private(set) var currentDate: Date = Date()
     @Published private(set) var upcomingEntries: [ReminderEntry] = []
     @Published private(set) var activeWindowReminders: [ReminderEntry] = []
+    @Published private(set) var lockScreenSnapshot: LockScreenReminderWidgetSnapshot?
 
     private let logger: os.Logger = os.Logger(subsystem: "com.ebullioscopic.Atoll", category: "ReminderLiveActivity")
 
@@ -42,6 +45,8 @@ final class ReminderLiveActivityManager: ObservableObject {
     private var hasShownCriticalSneakPeek = false
     private var latestEvents: [EventModel] = []
     private var pendingEventsSnapshot: [EventModel]? = nil
+    private var pendingEventsSignature: Int?
+    private var lastEventsSignature: Int?
     private var eventsUpdateDebounceTask: Task<Void, Never>? { didSet { oldValue?.cancel() } }
     private var upcomingComputationTask: Task<Void, Never>? { didSet { oldValue?.cancel() } }
     private let eventsDebounceInterval: TimeInterval = 0.35
@@ -50,6 +55,15 @@ final class ReminderLiveActivityManager: ObservableObject {
     private var pendingSettingsReason: String?
     private let settingsUpdateDebounceInterval: TimeInterval = 0.2
     private var suppressUpdatesForLock = false
+    private var deferredLockResumeTask: Task<Void, Never>? { didSet { oldValue?.cancel() } }
+    private var nextAllowedLockResumeRefresh: Date = .distantPast
+    private let lockResumeCooldown: TimeInterval = 5
+    private let lockScreenTimeFormatter: DateFormatter = {
+        let formatter = DateFormatter()
+        formatter.dateStyle = .none
+        formatter.timeStyle = .short
+        return formatter
+    }()
 
     private var lastAppliedLeadTime = Defaults[.reminderLeadTime]
     private var lastAppliedHideAllDay = Defaults[.hideAllDayEvents]
@@ -61,6 +75,7 @@ final class ReminderLiveActivityManager: ObservableObject {
 
     private init() {
         latestEvents = calendarManager.events
+        lastEventsSignature = makeEventsSignature(for: latestEvents)
         setupObservers()
         if !latestEvents.isEmpty {
             recalculateUpcomingEntries(reason: "initialization")
@@ -146,6 +161,10 @@ final class ReminderLiveActivityManager: ObservableObject {
             guard let self else { return }
             let delay = UInt64(settingsUpdateDebounceInterval * 1_000_000_000)
             try? await Task.sleep(nanoseconds: delay)
+            guard !Task.isCancelled else {
+                Logger.log("settingsUpdateTask cancelled after sleep", category: .debug)
+                return
+            }
             await self.applyPendingSettingsRecalculation()
         }
     }
@@ -172,10 +191,20 @@ final class ReminderLiveActivityManager: ObservableObject {
         upcomingEntries = []
         activeWindowReminders = []
         cancelAllTimers()
+        lockScreenSnapshot = nil
     }
 
     private func handleCalendarEventsUpdate(_ events: [EventModel]) {
+        let signature = makeEventsSignature(for: events)
+        if let pendingEventsSignature, pendingEventsSignature == signature {
+            pendingEventsSnapshot = events
+            return
+        }
+        if let lastEventsSignature, lastEventsSignature == signature {
+            return
+        }
         pendingEventsSnapshot = events
+        pendingEventsSignature = signature
         guard !suppressUpdatesForLock else { return }
         schedulePendingEventsSnapshotApplication()
     }
@@ -195,15 +224,26 @@ final class ReminderLiveActivityManager: ObservableObject {
         guard !suppressUpdatesForLock else { return }
         guard let snapshot = pendingEventsSnapshot else { return }
         pendingEventsSnapshot = nil
-        guard snapshot != latestEvents else { return }
+        let previousEvents = latestEvents
-
         latestEvents = snapshot
-        guard Defaults[.enableReminderLiveActivity] else { return }
+        if let pendingEventsSignature {
+            lastEventsSignature = pendingEventsSignature
+            self.pendingEventsSignature = nil
+        } else {
+            lastEventsSignature = makeEventsSignature(for: snapshot)
+        }
+
+        guard snapshot != previousEvents else { return }
+        guard Defaults[.enableReminderLiveActivity] else {
+            deactivateReminder()
+            return
+        }
         logger.debug("[Reminder] Applying calendar snapshot update (events=\(snapshot.count, privacy: .public))")
         recalculateUpcomingEntries(reason: "calendar-events")
     }
 
     private func handleLockStateChange(isLocked: Bool) {
+        Logger.log("Lock state changed: \(isLocked)", category: .lifecycle)
         suppressUpdatesForLock = isLocked
         if isLocked {
             eventsUpdateDebounceTask = nil
@@ -212,22 +252,63 @@ final class ReminderLiveActivityManager: ObservableObject {
             pendingSettingsAction = nil
             pendingSettingsReason = nil
             pauseReminderActivityForLock()
+            deferredLockResumeTask = nil
         } else {
-            if pendingEventsSnapshot != nil {
+            resumeAfterLockIfNeeded()
-                schedulePendingEventsSnapshotApplication()
-            } else {
-                recalculateUpcomingEntries(reason: "lock-resume")
-            }
         }
     }
 
     private func pauseReminderActivityForLock() {
+        Logger.log("Pausing reminder activity for lock", category: .lifecycle)
         tickerTask = nil
         evaluationTask?.cancel()
         evaluationTask = nil
     }
 
+    private func resumeAfterLockIfNeeded() {
+        Logger.log("Resuming reminder activity after lock", category: .lifecycle)
+        let now = Date()
+        if now < nextAllowedLockResumeRefresh {
+            let delay = nextAllowedLockResumeRefresh.timeIntervalSince(now)
+            scheduleDeferredLockResume(after: delay)
+            return
+        }
+        performLockResumeRefresh()
+    }
+
+    private func scheduleDeferredLockResume(after delay: TimeInterval) {
+        guard delay > 0 else {
+            performLockResumeRefresh()
+            return
+        }
+        deferredLockResumeTask = Task { [weak self] in
+            let nanoseconds = UInt64(delay * 1_000_000_000)
+            try? await Task.sleep(nanoseconds: nanoseconds)
+            guard !Task.isCancelled else {
+                Logger.log("deferredLockResumeTask cancelled after sleep", category: .debug)
+                return
+            }
+            await MainActor.run {
+                self?.performLockResumeRefresh()
+            }
+        }
+    }
+
+    @MainActor
+    private func performLockResumeRefresh() {
+        deferredLockResumeTask = nil
+        nextAllowedLockResumeRefresh = Date().addingTimeInterval(lockResumeCooldown)
+        if pendingEventsSnapshot != nil {
+            schedulePendingEventsSnapshotApplication()
+        } else {
+            Task { [weak self] in
+                await self?.evaluateCurrentState(at: Date(), source: "performLockResumeRefresh")
+            }
+        }
+    }
+
     private func recalculateUpcomingEntries(referenceDate: Date = Date(), reason: String) {
+        Logger.log("Recalculating upcoming entries. Reason: \(reason)", category: .debug)
         guard Defaults[.enableReminderLiveActivity] else {
             deactivateReminder()
             return
@@ -313,19 +394,24 @@ final class ReminderLiveActivityManager: ObservableObject {
         evaluationTask?.cancel()
         let delay = date.timeIntervalSinceNow
         guard delay > 0 else {
-            Task { await self.evaluateCurrentState(at: Date()) }
+            Task { await self.evaluateCurrentState(at: Date(), source: "scheduleEvaluation-immediate") }
             return
         }
 
         evaluationTask = Task { [weak self] in
             guard let self else { return }
             try? await Task.sleep(nanoseconds: UInt64(delay * 1_000_000_000))
-            await self.evaluateCurrentState(at: Date())
+            guard !Task.isCancelled else {
+                Logger.log("scheduleEvaluation task cancelled after sleep", category: .debug)
+                return
+            }
+            await self.evaluateCurrentState(at: Date(), source: "scheduleEvaluation-delayed")
         }
     }
 
     private func startTickerIfNeeded() {
         guard tickerTask == nil else { return }
+        Logger.log("Starting ticker", category: .debug)
         tickerTask = Task { [weak self] in
             while let self, !Task.isCancelled {
                 await self.handleTick()
@@ -344,22 +430,27 @@ final class ReminderLiveActivityManager: ObservableObject {
     }
 
     private func handleEntrySelection(_ entry: ReminderEntry?, referenceDate: Date) {
+        Logger.log("handleEntrySelection called for \(entry?.event.title ?? "nil")", category: .debug)
         guard nextReminder != entry else {
-            Task { await self.evaluateCurrentState(at: referenceDate) }
+            Logger.log("handleEntrySelection: entry matches nextReminder, forcing evaluation", category: .debug)
+            Task { await self.evaluateCurrentState(at: referenceDate, source: "handleEntrySelection-force") }
             return
         }
 
         nextReminder = entry
         hasShownCriticalSneakPeek = false
-        Task { await self.evaluateCurrentState(at: referenceDate) }
+        Task { await self.evaluateCurrentState(at: referenceDate, source: "handleEntrySelection-change") }
     }
 
-    func evaluateCurrentState(at date: Date) async {
+    func evaluateCurrentState(at date: Date, source: String = "unknown") async {
+        Logger.log("evaluateCurrentState at \(date) from \(source)", category: .debug)
         guard Defaults[.enableReminderLiveActivity] else {
             deactivateReminder()
             return
         }
 
+        defer { publishLockScreenSnapshot(referenceDate: date) }
+
         currentDate = date
         updateActiveWindowReminders(for: date)
 
@@ -374,8 +465,19 @@ final class ReminderLiveActivityManager: ObservableObject {
 
         if entry.event.start <= date {
             clearActiveReminderState()
-            logger.debug("[Reminder] Reminder reached start time; reevaluating reminders from cache")
+            Logger.log("[Reminder] Reminder reached start time; advancing to next reminder", category: .debug)
-            recalculateUpcomingEntries(referenceDate: date, reason: "evaluation-complete")
+            
+            // Robustly remove all expired entries.
+            // Note: We use event.start <= date instead of matching entry.id because
+            // entry might be a modified copy (with different triggerDate) that doesn't match
+            // the one in upcomingEntries, which would cause index lookup to fail and lead to an infinite loop.
+            upcomingEntries.removeAll { $0.event.start <= date }
+            
+            if let next = upcomingEntries.first {
+                handleEntrySelection(next, referenceDate: date)
+            } else {
+                Logger.log("[Reminder] No more upcoming reminders after expiration", category: .debug)
+            }
             return
         }
 
@@ -430,11 +532,12 @@ final class ReminderLiveActivityManager: ObservableObject {
 
     @MainActor
     private func handleTick() async {
+        // Logger.log("Tick", category: .debug) // Too verbose
         let now = Date()
         if abs(currentDate.timeIntervalSince(now)) >= 0.5 {
             currentDate = now
         }
-        await evaluateCurrentState(at: now)
+        await evaluateCurrentState(at: now, source: "handleTick")
     }
 
     private func updateActiveWindowReminders(for date: Date) {
@@ -447,6 +550,74 @@ final class ReminderLiveActivityManager: ObservableObject {
         }
     }
 
+    private func publishLockScreenSnapshot(referenceDate: Date) {
+        guard Defaults[.enableLockScreenReminderWidget] else {
+            if lockScreenSnapshot != nil {
+                lockScreenSnapshot = nil
+            }
+            return
+        }
+        guard let entry = activeReminder else {
+            if lockScreenSnapshot != nil {
+                lockScreenSnapshot = nil
+            }
+            return
+        }
+
+        let snapshot = buildLockScreenSnapshot(for: entry, now: referenceDate)
+        if lockScreenSnapshot != snapshot {
+            Logger.log("Publishing new lock screen snapshot: \(snapshot.title)", category: .debug)
+            lockScreenSnapshot = snapshot
+        }
+    }
+
+    private func buildLockScreenSnapshot(for entry: ReminderEntry, now: Date) -> LockScreenReminderWidgetSnapshot {
+        let title = entry.event.title.isEmpty ? "Upcoming Reminder" : entry.event.title
+        let isCritical = lockScreenCriticalWindowContains(entry: entry, now: now)
+        return LockScreenReminderWidgetSnapshot(
+            title: title,
+            eventTimeText: lockScreenTimeFormatter.string(from: entry.event.start),
+            relativeDescription: lockScreenRelativeDescription(for: entry, now: now),
+            accent: lockScreenAccentColor(for: entry, isCritical: isCritical),
+            chipStyle: Defaults[.lockScreenReminderChipStyle],
+            isCritical: isCritical,
+            iconName: isCritical ? Self.criticalIconName : Self.standardIconName
+        )
+    }
+
+    private func lockScreenAccentColor(for entry: ReminderEntry, isCritical: Bool) -> LockScreenReminderWidgetSnapshot.RGBAColor {
+        if isCritical {
+            return .init(nsColor: .systemRed)
+        }
+
+        let boosted = Color(nsColor: entry.event.calendar.color).ensureMinimumBrightness(factor: 0.7)
+        return .init(nsColor: NSColor(boosted))
+    }
+
+    private func lockScreenRelativeDescription(for entry: ReminderEntry, now: Date) -> String? {
+        let remaining = entry.event.start.timeIntervalSince(now)
+        if remaining <= 0 {
+            return "now"
+        }
+
+        let minutes = Int(ceil(remaining / 60))
+        switch minutes {
+        case ..<1:
+            return "now"
+        case 1:
+            return "in 1 min"
+        default:
+            return "in \(minutes) min"
+        }
+    }
+
+    private func lockScreenCriticalWindowContains(entry: ReminderEntry, now: Date) -> Bool {
+        let window = TimeInterval(Defaults[.reminderSneakPeekDuration])
+        guard window > 0 else { return false }
+        let remaining = entry.event.start.timeIntervalSince(now)
+        return remaining > 0 && remaining <= window
+    }
+
     static func additionalHeight(forRowCount rowCount: Int) -> CGFloat {
         guard rowCount > 0 else { return 0 }
         let rows = CGFloat(rowCount)
@@ -457,6 +628,48 @@ final class ReminderLiveActivityManager: ObservableObject {
 
 }
 
+extension ReminderLiveActivityManager {
+    private func makeEventsSignature(for events: [EventModel]) -> Int {
+        var hasher = Hasher()
+        hasher.combine(events.count)
+        for event in events {
+            hasher.combine(event.id)
+            hasher.combine(event.title)
+            hasher.combine(event.start.timeIntervalSinceReferenceDate.bitPattern)
+            hasher.combine(event.end.timeIntervalSinceReferenceDate.bitPattern)
+            hasher.combine(event.isAllDay)
+            hasher.combine(event.calendar.id)
+            hasher.combine(event.location ?? "")
+            switch event.type {
+            case .reminder(let completed):
+                hasher.combine(0)
+                hasher.combine(completed)
+            case .event(let attendance):
+                hasher.combine(1)
+                hasher.combine(hashValue(for: attendance))
+            case .birthday:
+                hasher.combine(2)
+            }
+        }
+        return hasher.finalize()
+    }
+
+    private func hashValue(for status: AttendanceStatus) -> Int {
+        switch status {
+        case .accepted:
+            return 1
+        case .maybe:
+            return 2
+        case .pending:
+            return 3
+        case .declined:
+            return 4
+        case .unknown:
+            return 5
+        }
+    }
+}
+
 extension ReminderLiveActivityManager.ReminderEntry: Identifiable {
     var id: String { event.id }
 }

DynamicIsland/models/LockScreenReminderWidgetSnapshot.swift

@@ -0,0 +1,31 @@
+import SwiftUI
+import AppKit
+
+struct LockScreenReminderWidgetSnapshot: Equatable {
+    struct RGBAColor: Equatable {
+        let red: Double
+        let green: Double
+        let blue: Double
+        let alpha: Double
+
+        init(nsColor: NSColor) {
+            let color = nsColor.usingColorSpace(.sRGB) ?? nsColor
+            self.red = Double(color.redComponent)
+            self.green = Double(color.greenComponent)
+            self.blue = Double(color.blueComponent)
+            self.alpha = Double(color.alphaComponent)
+        }
+
+        var color: Color {
+            Color(red: red, green: green, blue: blue, opacity: alpha)
+        }
+    }
+
+    let title: String
+    let eventTimeText: String
+    let relativeDescription: String?
+    let accent: RGBAColor
+    let chipStyle: LockScreenReminderChipStyle
+    let isCritical: Bool
+    let iconName: String
+}