Add unified task menu, Live Activity, and calendar event actions

Task context menu (new shared TaskMenuItems) consistent across Today,
Matrix, and Calendar: Pin · Date · Move · Priority · Tags · Add to Live
Activity · Delete. Adds TaskViewModel.setPriority.

Live Activity (ActivityKit):
- TaskActivityAttributes shared between app and widget targets
- LiveActivityManager (start/update/end/toggle, iOS 16.1+)
- TaskLiveActivity widget: lock-screen banner + Dynamic Island
- NSSupportsLiveActivities via project.yml; project regenerated

Calendar events (non-subscription, writable only):
- Edit via system EKEventEditViewController (EventEditView wrapper)
- Delete via new CalendarStore.deleteEvent

Also sweeps in prior in-progress edits already present in the working
tree (AuthManager, NotificationManager, TaskItem, task views) and the
updated ISSUES.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

KisaniCal/Models/TaskItem.swift

@@ -19,6 +19,7 @@ struct TaskItem: Identifiable, Codable, Equatable {
     var isAllDay: Bool = false
     var priority: Priority = .none
     var reminderDate: Date? = nil
+    var constantReminder: Bool = false
 }
 
 enum Priority: String, Codable, CaseIterable, Identifiable {
@@ -236,6 +237,12 @@ class TaskViewModel: ObservableObject {
         tasks[idx].category = category
         save()
     }
+
+    func setPriority(_ task: TaskItem, priority: Priority) {
+        guard let idx = tasks.firstIndex(where: { $0.id == task.id }) else { return }
+        tasks[idx].priority = priority
+        save()
+    }
     func moveToQuadrant(taskID: UUID, quadrant: Quadrant) {
         guard let idx = tasks.firstIndex(where: { $0.id == taskID }) else { return }
         tasks[idx].quadrant = quadrant
@@ -247,28 +254,32 @@ class TaskViewModel: ObservableObject {
                  taskColor: TaskColor = .orange, isRecurring: Bool = false,
                  recurrenceLabel: String? = nil,
                  endDate: Date? = nil, isAllDay: Bool = false,
-                 priority: Priority = .none, reminderDate: Date? = nil) {
+                 priority: Priority = .none, reminderDate: Date? = nil,
+                 constantReminder: Bool = false) {
         tasks.append(TaskItem(title: title, dueDate: dueDate, hasTime: hasTime,
                               quadrant: quadrant, category: category,
                               taskColor: taskColor, isRecurring: isRecurring,
                               recurrenceLabel: recurrenceLabel,
                               endDate: endDate, isAllDay: isAllDay,
-                              priority: priority, reminderDate: reminderDate))
+                              priority: priority, reminderDate: reminderDate,
+                              constantReminder: constantReminder))
         save()
     }
 
     func updateTask(_ task: TaskItem, title: String, dueDate: Date?, hasTime: Bool,
                     isRecurring: Bool, recurrenceLabel: String?,
-                    endDate: Date?, isAllDay: Bool, reminderDate: Date?) {
+                    endDate: Date?, isAllDay: Bool, reminderDate: Date?,
+                    constantReminder: Bool = false) {
         guard let idx = tasks.firstIndex(where: { $0.id == task.id }) else { return }
-        tasks[idx].title           = title
-        tasks[idx].dueDate         = dueDate
-        tasks[idx].hasTime         = hasTime
-        tasks[idx].isRecurring     = isRecurring
-        tasks[idx].recurrenceLabel = recurrenceLabel
-        tasks[idx].endDate         = endDate
-        tasks[idx].isAllDay        = isAllDay
-        tasks[idx].reminderDate    = reminderDate
+        tasks[idx].title            = title
+        tasks[idx].dueDate          = dueDate
+        tasks[idx].hasTime          = hasTime
+        tasks[idx].isRecurring      = isRecurring
+        tasks[idx].recurrenceLabel  = recurrenceLabel
+        tasks[idx].endDate          = endDate
+        tasks[idx].isAllDay         = isAllDay
+        tasks[idx].reminderDate     = reminderDate
+        tasks[idx].constantReminder = constantReminder
         save()
     }