Rearchitect UI test suite for complete, non-flaky coverage against live API

- Migrate Suite4-10, SmokeTests, NavigationCriticalPathTests to AuthenticatedTestCase
  with seeded admin account and real backend login
- Add 34 accessibility identifiers across 11 app views (task completion, profile,
  notifications, theme, join residence, manage users, forms)
- Create FeatureCoverageTests (14 tests) covering previously untested features:
  profile edit, theme selection, notification prefs, task completion, manage users,
  join residence, task templates
- Create MultiUserSharingTests (18 API tests) and MultiUserSharingUITests (8 XCUI
  tests) for full cross-user residence sharing lifecycle
- Add cleanup infrastructure: SuiteZZ_CleanupTests auto-wipes test data after runs,
  cleanup_test_data.sh script for manual reset via admin API
- Add share code API methods to TestAccountAPIClient (generateShareCode, joinWithCode,
  getShareCode, listResidenceUsers, removeUser)
- Fix app bugs found by tests:
  - ResidencesListView join callback now uses forceRefresh:true
  - APILayer invalidates task cache when residence count changes
  - AllTasksView auto-reloads tasks when residence list changes
- Fix test quality: keyboard focus waits, Save/Add button label matching,
  Documents tab label (Docs), remove API verification from UI tests
- DataLayerTests and PasswordResetTests now verify through UI, not API calls

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

iosApp/iosApp/Contractor/ContractorFormSheet.swift

@@ -60,6 +60,7 @@ struct ContractorFormSheet: View {
                             .frame(width: 24)
                         TextField(L10n.Contractors.nameLabel, text: $name)
                             .focused($focusedField, equals: .name)
+                            .accessibilityIdentifier(AccessibilityIdentifiers.Contractor.nameField)
                     }
 
                     HStack {
@@ -68,6 +69,7 @@ struct ContractorFormSheet: View {
                             .frame(width: 24)
                         TextField(L10n.Contractors.companyLabel, text: $company)
                             .focused($focusedField, equals: .company)
+                            .accessibilityIdentifier(AccessibilityIdentifiers.Contractor.companyField)
                     }
                 } header: {
                     Text(L10n.Contractors.basicInfoSection)
@@ -116,6 +118,7 @@ struct ContractorFormSheet: View {
                             .keyboardType(.phonePad)
                             .focused($focusedField, equals: .phone)
                             .keyboardDismissToolbar()
+                            .accessibilityIdentifier(AccessibilityIdentifiers.Contractor.phoneField)
                     }
 
                     HStack {
@@ -127,6 +130,7 @@ struct ContractorFormSheet: View {
                             .textInputAutocapitalization(.never)
                             .autocorrectionDisabled()
                             .focused($focusedField, equals: .email)
+                            .accessibilityIdentifier(AccessibilityIdentifiers.Contractor.emailField)
                     }
 
                     HStack {
@@ -168,6 +172,7 @@ struct ContractorFormSheet: View {
                                 .foregroundColor(Color.appTextSecondary.opacity(0.7))
                         }
                     }
+                    .accessibilityIdentifier(AccessibilityIdentifiers.Contractor.specialtyPicker)
                 } header: {
                     Text(L10n.Contractors.specialtiesSection)
                 }
@@ -226,6 +231,7 @@ struct ContractorFormSheet: View {
                             .frame(height: 100)
                             .focused($focusedField, equals: .notes)
                             .keyboardDismissToolbar()
+                            .accessibilityIdentifier(AccessibilityIdentifiers.Contractor.notesField)
                     }
                 } header: {
                     Text(L10n.Contractors.notesSection)
@@ -269,6 +275,7 @@ struct ContractorFormSheet: View {
                     Button(L10n.Common.cancel) {
                         dismiss()
                     }
+                    .accessibilityIdentifier(AccessibilityIdentifiers.Contractor.formCancelButton)
                 }
 
                 ToolbarItem(placement: .confirmationAction) {
@@ -281,6 +288,7 @@ struct ContractorFormSheet: View {
                         }
                     }
                     .disabled(!canSave || viewModel.isCreating || viewModel.isUpdating)
+                    .accessibilityIdentifier(AccessibilityIdentifiers.Contractor.saveButton)
                 }
             }
             .sheet(isPresented: $showingResidencePicker) {