Add XCUITest suite with 27 test files covering unmapped P1 test cases

- Add 8 new test files: HeaderMoodLogging (TC-002), DayViewGrouping (TC-019),
  AllDayViewStyles (TC-021), MonthViewInteraction (TC-030), PaywallGate
  (TC-032/039/048), AppTheme (TC-070), IconPack (TC-072),
  PremiumCustomization (TC-075)
- Add accessibility IDs for paywall overlays, icon packs, app theme cards,
  and day view section headers
- Add --expire-trial launch argument to UITestMode for paywall gate testing
- Update QA test plan spreadsheet with XCUITest names for 14 test cases
- Include existing test infrastructure: screen objects, helpers, base class,
  and 19 previously written test files

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

Tests iOS/EntryDetailTests.swift

@@ -0,0 +1,62 @@
+//
+//  EntryDetailTests.swift
+//  Tests iOS
+//
+//  Entry detail sheet open/dismiss and mood change tests.
+//
+
+import XCTest
+
+final class EntryDetailTests: BaseUITestCase {
+    override var seedFixture: String? { "week_of_moods" }
+
+    /// Tap an entry row -> Entry Detail sheet opens -> dismiss it.
+    func testTapEntry_OpensDetailSheet_Dismiss() {
+        // Find the first entry row by identifier prefix
+        let firstEntry = app.descendants(matching: .any)
+            .matching(NSPredicate(format: "identifier BEGINSWITH %@", "entry_row_"))
+            .firstMatch
+
+        guard firstEntry.waitForExistence(timeout: 5) else {
+            XCTFail("No entry rows found in seeded data")
+            return
+        }
+
+        firstEntry.tap()
+
+        let detailScreen = EntryDetailScreen(app: app)
+        detailScreen.assertVisible()
+
+        captureScreenshot(name: "entry_detail_open")
+
+        // Dismiss the sheet
+        detailScreen.dismiss()
+        detailScreen.assertDismissed()
+    }
+
+    /// Open entry detail and change mood, then dismiss.
+    func testChangeMood_ViaEntryDetail() {
+        let firstEntry = app.descendants(matching: .any)
+            .matching(NSPredicate(format: "identifier BEGINSWITH %@", "entry_row_"))
+            .firstMatch
+
+        guard firstEntry.waitForExistence(timeout: 5) else {
+            XCTFail("No entry rows found in seeded data")
+            return
+        }
+
+        firstEntry.tap()
+
+        let detailScreen = EntryDetailScreen(app: app)
+        detailScreen.assertVisible()
+
+        // Select a different mood (Bad)
+        detailScreen.selectMood(.bad)
+
+        captureScreenshot(name: "mood_changed_to_bad")
+
+        // Dismiss
+        detailScreen.dismiss()
+        detailScreen.assertDismissed()
+    }
+}