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/Task/CompleteTaskView.swift

@@ -93,6 +93,7 @@ struct CompleteTaskView: View {
                                 .foregroundStyle(.tertiary)
                         }
                     }
+                    .accessibilityIdentifier("TaskCompletion.ContractorPicker")
                 } header: {
                     Text(L10n.Tasks.contractorOptional)
                 } footer: {
@@ -120,6 +121,7 @@ struct CompleteTaskView: View {
                             }
                             .padding(.leading, 12)
                             .keyboardDismissToolbar()
+                            .accessibilityIdentifier(AccessibilityIdentifiers.Task.actualCostField)
                     } label: {
                         Label(L10n.Tasks.actualCost, systemImage: "dollarsign.circle")
                     }
@@ -141,6 +143,7 @@ struct CompleteTaskView: View {
                             .frame(minHeight: 100)
                             .scrollContentBackground(.hidden)
                             .keyboardDismissToolbar()
+                            .accessibilityIdentifier(AccessibilityIdentifiers.Task.notesField)
                     }
                 } footer: {
                     Text(L10n.Tasks.optionalNotes)
@@ -176,6 +179,7 @@ struct CompleteTaskView: View {
                         }
                         .frame(maxWidth: .infinity)
                     }
+                    .accessibilityIdentifier(AccessibilityIdentifiers.Task.ratingView)
                 } footer: {
                     Text(L10n.Tasks.rateQuality)
                 }
@@ -263,6 +267,7 @@ struct CompleteTaskView: View {
                         .frame(maxWidth: .infinity)
                         .fontWeight(.semibold)
                     }
+                    .accessibilityIdentifier(AccessibilityIdentifiers.Task.submitButton)
                     .listRowBackground(isSubmitting ? Color.gray : Color.appPrimary)
                     .foregroundStyle(Color.appTextOnPrimary)
                     .disabled(isSubmitting)