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/AppLaunchTests.swift

@@ -31,22 +31,30 @@ final class AppLaunchTests: BaseUITestCase {
 
         // Month tab
         tabBar.tapMonth()
-        XCTAssertTrue(tabBar.monthTab.isSelected, "Month tab should be selected")
+        assertTabSelected(tabBar.monthTab, name: "Month")
 
         // Year tab
         tabBar.tapYear()
-        XCTAssertTrue(tabBar.yearTab.isSelected, "Year tab should be selected")
+        assertTabSelected(tabBar.yearTab, name: "Year")
 
         // Insights tab
         tabBar.tapInsights()
-        XCTAssertTrue(tabBar.insightsTab.isSelected, "Insights tab should be selected")
+        assertTabSelected(tabBar.insightsTab, name: "Insights")
 
         // Settings tab
         tabBar.tapSettings()
-        XCTAssertTrue(tabBar.settingsTab.isSelected, "Settings tab should be selected")
+        assertTabSelected(tabBar.settingsTab, name: "Settings")
 
         // Back to Day
         tabBar.tapDay()
-        XCTAssertTrue(tabBar.dayTab.isSelected, "Day tab should be selected")
+        assertTabSelected(tabBar.dayTab, name: "Day")
+    }
+
+    /// Wait for a tab to become selected (iOS 26 Liquid Glass may delay state updates).
+    private func assertTabSelected(_ tab: XCUIElement, name: String, timeout: TimeInterval = 3) {
+        let predicate = NSPredicate(format: "isSelected == true")
+        let expectation = XCTNSPredicateExpectation(predicate: predicate, object: tab)
+        let result = XCTWaiter.wait(for: [expectation], timeout: timeout)
+        XCTAssertEqual(result, .completed, "\(name) tab should be selected")
     }
 }