Add cancel task confirmation dialog

- Add L10n strings for cancel confirmation
- Add confirmation dialog to ResidenceDetailView
- Fix AllTasksView cancel dialog (was using archive strings)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

iosApp/iosApp/Residence/ResidenceDetailView.swift

@@ -25,6 +25,8 @@ struct ResidenceDetailView: View {
     @State private var selectedTaskForComplete: TaskResponse?
     @State private var selectedTaskForArchive: TaskResponse?
     @State private var showArchiveConfirmation = false
+    @State private var selectedTaskForCancel: TaskResponse?
+    @State private var showCancelConfirmation = false
 
     @State private var hasAppeared = false
     @State private var showReportAlert = false
@@ -144,6 +146,21 @@ struct ResidenceDetailView: View {
                 Text("Are you sure you want to archive \"\(task.title)\"? You can unarchive it later from archived tasks.")
             }
         }
+        .alert(L10n.Tasks.cancelTask, isPresented: $showCancelConfirmation) {
+            Button(L10n.Common.no, role: .cancel) {
+                selectedTaskForCancel = nil
+            }
+            Button(L10n.Common.yes, role: .destructive) {
+                if let task = selectedTaskForCancel {
+                    taskViewModel.cancelTask(id: task.id) { _ in
+                        loadResidenceTasks()
+                    }
+                    selectedTaskForCancel = nil
+                }
+            }
+        } message: {
+            Text(L10n.Tasks.cancelConfirm)
+        }
         .sheet(isPresented: $showingUpgradePrompt) {
             UpgradePromptView(triggerKey: upgradeTriggerKey.isEmpty ? "add_11th_task" : upgradeTriggerKey, isPresented: $showingUpgradePrompt)
         }
@@ -489,9 +506,8 @@ private struct TasksSectionContainer: View {
                 showEditTask = true
             },
             onCancelTask: { task in
-                taskViewModel.cancelTask(id: task.id) { _ in
-                    reloadTasks()
-                }
+                selectedTaskForCancel = task
+                showCancelConfirmation = true
             },
             onUncancelTask: { taskId in
                 taskViewModel.uncancelTask(id: taskId) { _ in