Stabilize iOS UI test foundation and fix flaky suites

Shared/Views/CustomizeView/SubViews/AppThemePickerView.swift

@@ -60,6 +60,7 @@ struct AppThemePickerView: View {
                     Button("Done") {
                         dismiss()
                     }
+                    .accessibilityIdentifier(AccessibilityID.Customize.appThemePickerDoneButton)
                 }
             }
             .sheet(item: $selectedTheme) { theme in
@@ -250,6 +251,7 @@ struct AppThemePreviewSheet: View {
                     Button("Cancel") {
                         dismiss()
                     }
+                    .accessibilityIdentifier(AccessibilityID.Customize.appThemePreviewCancelButton)
                 }
             }
         }
@@ -352,6 +354,7 @@ struct AppThemePreviewSheet: View {
             .shadow(color: theme.previewColors[0].opacity(0.4), radius: 8, x: 0, y: 4)
         }
         .padding(.horizontal, 20)
+        .accessibilityIdentifier(AccessibilityID.Customize.appThemePreviewApplyButton)
     }
 
     private func iconName(for pack: MoodImages) -> String {

Shared/Views/MainTabView.swift

@@ -27,26 +27,31 @@ struct MainTabView: View {
             dayView
                 .tabItem {
                     Label(String(localized: "content_view_tab_main"), systemImage: "list.dash")
+                        .accessibilityIdentifier(AccessibilityID.Tab.day)
                 }
 
             monthView
                 .tabItem {
                     Label(String(localized: "content_view_tab_month"), systemImage: "calendar")
+                        .accessibilityIdentifier(AccessibilityID.Tab.month)
                 }
 
            yearView
                 .tabItem {
                     Label(String(localized: "content_view_tab_filter"), systemImage: "line.3.horizontal.decrease.circle")
+                        .accessibilityIdentifier(AccessibilityID.Tab.year)
                 }
 
             insightsView
                 .tabItem {
                     Label(String(localized: "content_view_tab_insights"), systemImage: "lightbulb.fill")
+                        .accessibilityIdentifier(AccessibilityID.Tab.insights)
                 }
 
             SettingsTabView()
                 .tabItem {
                     Label("Settings", systemImage: "gear")
+                        .accessibilityIdentifier(AccessibilityID.Tab.settings)
                 }
         }
         .accentColor(textColor)

Shared/Views/SettingsView/SettingsTabView.swift

@@ -50,7 +50,9 @@ struct SettingsTabView: View {
             // Segmented control
             Picker("", selection: $selectedTab) {
                 ForEach(SettingsTab.allCases, id: \.self) { tab in
-                    Text(tab.rawValue).tag(tab)
+                    Text(tab.rawValue)
+                        .accessibilityIdentifier(tab == .customize ? AccessibilityID.Settings.customizeTab : AccessibilityID.Settings.settingsTab)
+                        .tag(tab)
                 }
             }
             .pickerStyle(.segmented)