Fix task edit button not opening edit sheet in ResidenceDetailView

The onEditTask callback was setting selectedTaskForEdit but never
setting showEditTask to true, so the sheet never appeared. Added
showEditTask binding to TasksSectionContainer and set it when editing.

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

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

iosApp/iosApp/Residence/ResidenceDetailView.swift

@@ -228,6 +228,7 @@ private extension ResidenceDetailView {
                 tasksResponse: tasksResponse,
                 taskViewModel: taskViewModel,
                 selectedTaskForEdit: $selectedTaskForEdit,
+                showEditTask: $showEditTask,
                 selectedTaskForComplete: $selectedTaskForComplete,
                 selectedTaskForArchive: $selectedTaskForArchive,
                 showArchiveConfirmation: $showArchiveConfirmation,
@@ -456,17 +457,19 @@ private struct TasksSectionContainer: View {
 
     @ObservedObject var taskViewModel: TaskViewModel
     @Binding var selectedTaskForEdit: TaskResponse?
+    @Binding var showEditTask: Bool
     @Binding var selectedTaskForComplete: TaskResponse?
     @Binding var selectedTaskForArchive: TaskResponse?
     @Binding var showArchiveConfirmation: Bool
 
     let reloadTasks: () -> Void
-    
+
     var body: some View {
         TasksSection(
             tasksResponse: tasksResponse,
             onEditTask: { task in
                 selectedTaskForEdit = task
+                showEditTask = true
             },
             onCancelTask: { taskId in
                 taskViewModel.cancelTask(id: taskId) { _ in