Fix: tapping task notification now marks it complete

Tap body → marks complete + navigates to tasks.
Swipe action 'Mark Complete' → marks complete without opening app.
TaskViewModel.reload() called on foreground to sync UserDefaults changes
made while app was backgrounded.

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

KisaniCal/Models/TaskItem.swift

@@ -72,6 +72,13 @@ class TaskViewModel: ObservableObject {
         }
     }
 
+    func reload() {
+        guard let data  = UserDefaults.standard.data(forKey: persistKey),
+              let saved = try? JSONDecoder().decode([TaskItem].self, from: data)
+        else { return }
+        tasks = saved
+    }
+
     private func save() {
         if let data = try? JSONEncoder().encode(tasks) {
             UserDefaults.standard.set(data, forKey: persistKey)