Add contractor management and integrate with task completions

Features:
- Add full contractor CRUD functionality (Android & iOS)
- Add contractor selection to task completion dialog
- Display contractor info in completion cards
- Add ContractorSpecialty model and API integration
- Add contractors tab to bottom navigation
- Replace hardcoded specialty lists with API data
- Update lookup endpoints to return arrays instead of paginated responses

Changes:
- Add Contractor models (ContractorSummary, ContractorDetail, ContractorCreate/UpdateRequest)
- Add ContractorApi with endpoints for list, detail, create, update, delete, toggle favorite
- Add ContractorViewModel for state management
- Add ContractorsScreen and ContractorDetailScreen for Android
- Add AddContractorDialog with form validation
- Add Contractor views for iOS (list, detail, form)
- Update CompleteTaskDialog to include contractor selection
- Update CompletionCardView to show contractor name and phone
- Add contractor field to TaskCompletion model
- Update LookupsApi to return List<T> instead of paginated responses
- Update LookupsRepository and LookupsViewModel to handle array responses
- Update LookupsManager (iOS) to handle array responses for contractor specialties

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

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

iosApp/iosApp/Task/CompleteTaskView.swift

@@ -8,6 +8,7 @@ struct CompleteTaskView: View {
 
     @Environment(\.dismiss) private var dismiss
     @StateObject private var taskViewModel = TaskViewModel()
+    @StateObject private var contractorViewModel = ContractorViewModel()
     @State private var completedByName: String = ""
     @State private var actualCost: String = ""
     @State private var notes: String = ""
@@ -18,6 +19,8 @@ struct CompleteTaskView: View {
     @State private var showError: Bool = false
     @State private var errorMessage: String = ""
     @State private var showCamera: Bool = false
+    @State private var selectedContractor: ContractorSummary? = nil
+    @State private var showContractorPicker: Bool = false
 
     var body: some View {
         NavigationStack {
@@ -50,11 +53,49 @@ struct CompleteTaskView: View {
                     Text("Task Details")
                 }
 
+                // Contractor Selection Section
+                Section {
+                    Button(action: {
+                        showContractorPicker = true
+                    }) {
+                        HStack {
+                            Label("Select Contractor", systemImage: "wrench.and.screwdriver")
+                                .foregroundStyle(.primary)
+
+                            Spacer()
+
+                            if let contractor = selectedContractor {
+                                VStack(alignment: .trailing) {
+                                    Text(contractor.name)
+                                        .foregroundStyle(.secondary)
+                                    if let company = contractor.company {
+                                        Text(company)
+                                            .font(.caption)
+                                            .foregroundStyle(.tertiary)
+                                    }
+                                }
+                            } else {
+                                Text("None")
+                                    .foregroundStyle(.tertiary)
+                            }
+
+                            Image(systemName: "chevron.right")
+                                .font(.caption)
+                                .foregroundStyle(.tertiary)
+                        }
+                    }
+                } header: {
+                    Text("Contractor (Optional)")
+                } footer: {
+                    Text("Select a contractor if they completed this work, or leave blank for manual entry.")
+                }
+
                 // Completion Details Section
                 Section {
                     LabeledContent {
                         TextField("Your name", text: $completedByName)
                             .multilineTextAlignment(.trailing)
+                            .disabled(selectedContractor != nil)
                     } label: {
                         Label("Completed By", systemImage: "person")
                     }
@@ -228,6 +269,15 @@ struct CompleteTaskView: View {
                     }
                 }
             }
+            .sheet(isPresented: $showContractorPicker) {
+                ContractorPickerView(
+                    selectedContractor: $selectedContractor,
+                    contractorViewModel: contractorViewModel
+                )
+            }
+            .onAppear {
+                contractorViewModel.loadContractors()
+            }
         }
     }
 
@@ -249,7 +299,11 @@ struct CompleteTaskView: View {
         let request = TaskCompletionCreateRequest(
             task: task.id,
             completedByUser: nil,
+            contractor: selectedContractor != nil ? KotlinInt(int: selectedContractor!.id) : nil,
             completedByName: completedByName.isEmpty ? nil : completedByName,
+            completedByPhone: selectedContractor?.phone ?? "",
+            completedByEmail: "",
+            companyName: selectedContractor?.company ?? "",
             completionDate: currentDate,
             actualCost: actualCost.isEmpty ? nil : actualCost,
             notes: notes.isEmpty ? nil : notes,
@@ -310,3 +364,96 @@ extension KotlinByteArray {
     }
 }
 
+// MARK: - Contractor Picker View
+struct ContractorPickerView: View {
+    @Environment(\.dismiss) private var dismiss
+    @Binding var selectedContractor: ContractorSummary?
+    @ObservedObject var contractorViewModel: ContractorViewModel
+
+    var body: some View {
+        NavigationStack {
+            List {
+                // None option
+                Button(action: {
+                    selectedContractor = nil
+                    dismiss()
+                }) {
+                    HStack {
+                        VStack(alignment: .leading) {
+                            Text("None (Manual Entry)")
+                                .foregroundStyle(.primary)
+                            Text("Enter name manually")
+                                .font(.caption)
+                                .foregroundStyle(.secondary)
+                        }
+                        Spacer()
+                        if selectedContractor == nil {
+                            Image(systemName: "checkmark")
+                                .foregroundStyle(AppColors.primary)
+                        }
+                    }
+                }
+
+                // Contractors list
+                if contractorViewModel.isLoading {
+                    HStack {
+                        Spacer()
+                        ProgressView()
+                        Spacer()
+                    }
+                } else if let errorMessage = contractorViewModel.errorMessage {
+                    Text(errorMessage)
+                        .foregroundStyle(.red)
+                        .font(.caption)
+                } else {
+                    ForEach(contractorViewModel.contractors, id: \.id) { contractor in
+                        Button(action: {
+                            selectedContractor = contractor
+                            dismiss()
+                        }) {
+                            HStack {
+                                VStack(alignment: .leading, spacing: 4) {
+                                    Text(contractor.name)
+                                        .foregroundStyle(.primary)
+
+                                    if let company = contractor.company {
+                                        Text(company)
+                                            .font(.caption)
+                                            .foregroundStyle(.secondary)
+                                    }
+
+                                    if let specialty = contractor.specialty {
+                                        HStack(spacing: 4) {
+                                            Image(systemName: "wrench.and.screwdriver")
+                                                .font(.caption2)
+                                            Text(specialty)
+                                                .font(.caption2)
+                                        }
+                                        .foregroundStyle(.tertiary)
+                                    }
+                                }
+
+                                Spacer()
+
+                                if selectedContractor?.id == contractor.id {
+                                    Image(systemName: "checkmark")
+                                        .foregroundStyle(AppColors.primary)
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            .navigationTitle("Select Contractor")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Cancel") {
+                        dismiss()
+                    }
+                }
+            }
+        }
+    }
+}
+

iosApp/iosApp/Task/TaskViewModel.swift

@@ -243,7 +243,11 @@ class TaskViewModel: ObservableObject {
         let request = TaskCompletionCreateRequest(
             task: taskId,
             completedByUser: nil,
+            contractor: nil,
             completedByName: nil,
+            completedByPhone: nil,
+            completedByEmail: nil,
+            companyName: nil,
             completionDate: currentDate,
             actualCost: nil,
             notes: nil,