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>

Tests iOS/IconPackTests.swift

@@ -40,7 +40,7 @@ final class IconPackTests: BaseUITestCase {
                 app.swipeUp()
             }
             if button.waitForExistence(timeout: 3) {
-                button.tapWhenReady()
+                button.coordinate(withNormalizedOffset: CGVector(dx: 0.5, dy: 0.5)).tap()
             } else {
                 XCTFail("Icon pack button '\(pack)' should exist in the customize view")
             }