Fix remaining 17 UI test failures: group defaults, identifiers, hittability, date format

- resetAppState: use correct suite name to clear group defaults (fixes stale subscription state)
- Reorder configureIfNeeded: set expireTrial before IAPManager init
- Add browse_themes_button identifier to CustomizeView Browse Themes button
- Add mood_button_* identifiers to Entry Detail mood grid in NoteEditorView
- Use coordinate-based tap throughout all test screens (iOS 26 Liquid Glass hittability)
- Fix HeaderMoodLogging date format: M/d/yyyy → yyyy/MM/dd to match entry_row identifiers
- AppLaunchTests: wait for isSelected state with NSPredicate instead of immediate check
- OnboardingTests: add waits between swipes and retry logic for skip button

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Shared/Views/CustomizeView/CustomizeView.swift

@@ -56,6 +56,7 @@ struct CustomizeContentView: View {
                         .padding(12)
                     }
                     .buttonStyle(.plain)
+                    .accessibilityIdentifier(AccessibilityID.Settings.browseThemesButton)
                 }
                 .sheet(isPresented: $showThemePicker) {
                     AppThemePickerView()