Add residence deletion functionality for iOS and Android

- Add delete residence button to iOS ResidenceDetailView (primary owners only)
- Add delete confirmation alert for iOS with destructive action
- Implement deleteResidence API call in iOS with navigation on success
- Add delete residence button to Android ResidenceDetailScreen (primary owners only)
- Add delete confirmation dialog for Android with error-colored button
- Add deleteResidenceState to ResidenceViewModel with StateFlow
- Implement deleteResidence() and resetDeleteResidenceState() in ViewModel
- Add LaunchedEffect to handle delete success (navigates back) and errors
- Display delete button with red/error styling on both platforms
- Restrict delete functionality to primary owners only

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

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

iosApp/iosApp/Residence/ResidenceDetailView.swift

@@ -16,6 +16,9 @@ struct ResidenceDetailView: View {
     @State private var selectedTaskForComplete: TaskDetail?
     @State private var hasAppeared = false
     @State private var showReportAlert = false
+    @State private var showDeleteConfirmation = false
+    @State private var isDeleting = false
+    @Environment(\.dismiss) private var dismiss
 
     var body: some View {
         ZStack {
@@ -134,6 +137,16 @@ struct ResidenceDetailView: View {
                 }) {
                     Image(systemName: "plus")
                 }
+
+                // Delete button - only show for primary owners
+                if let residence = viewModel.selectedResidence, residence.isPrimaryOwner {
+                    Button(action: {
+                        showDeleteConfirmation = true
+                    }) {
+                        Image(systemName: "trash")
+                            .foregroundStyle(.red)
+                    }
+                }
             }
         }
         .sheet(isPresented: $showAddTask) {
@@ -189,6 +202,14 @@ struct ResidenceDetailView: View {
         } message: {
             Text(viewModel.reportMessage ?? "")
         }
+        .alert("Delete Residence", isPresented: $showDeleteConfirmation) {
+            Button("Cancel", role: .cancel) { }
+            Button("Delete", role: .destructive) {
+                deleteResidence()
+            }
+        } message: {
+            Text("Are you sure you want to delete this residence? This action cannot be undone.")
+        }
         .onAppear {
             loadResidenceData()
         }
@@ -224,6 +245,29 @@ struct ResidenceDetailView: View {
             }
         }
     }
+
+    private func deleteResidence() {
+        guard let token = TokenStorage.shared.getToken() else { return }
+
+        isDeleting = true
+
+        let residenceApi = ResidenceApi(client: ApiClient_iosKt.createHttpClient())
+        residenceApi.deleteResidence(token: token, id: residenceId) { result, error in
+            DispatchQueue.main.async {
+                self.isDeleting = false
+
+                if result is ApiResultSuccess<KotlinUnit> {
+                    // Navigate back to residence list
+                    self.dismiss()
+                } else if let errorResult = result as? ApiResultError {
+                    // Show error message
+                    self.viewModel.errorMessage = errorResult.message
+                } else if let error = error {
+                    self.viewModel.errorMessage = error.localizedDescription
+                }
+            }
+        }
+    }
 }
 
 #Preview {