Fix iOS widget to use App Group shared data and add large widget view

- Create WidgetDataManager to write task data as JSON to App Group shared container
- Update widget CacheManager to read from App Group file instead of UserDefaults
- Add LargeWidgetView for .systemLarge widget family showing 5-6 tasks
- Add widget data save in AllTasksView after tasks load successfully
- Clear widget cache on logout in AuthenticationManager
- Add residenceName and isOverdue fields to widget task model

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

iosApp/iosApp/Task/AllTasksView.swift

@@ -281,10 +281,14 @@ struct AllTasksView: View {
             do {
                 let result = try await APILayer.shared.getTasks(forceRefresh: forceRefresh)
                 await MainActor.run {
-                    if let success = result as? ApiResultSuccess<TaskColumnsResponse> {
-                        self.tasksResponse = success.data
+                    if let success = result as? ApiResultSuccess<TaskColumnsResponse>,
+                       let data = success.data {
+                        self.tasksResponse = data
                         self.isLoadingTasks = false
                         self.tasksError = nil
+
+                        // Update widget data
+                        WidgetDataManager.shared.saveTasks(from: data)
                     } else if let error = result as? ApiResultError {
                         self.tasksError = error.message
                         self.isLoadingTasks = false