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>

Shared/Views/NoteEditorView.swift

@@ -45,6 +45,7 @@ struct NoteEditorView: View {
                         .frame(maxHeight: .infinity)
                         .scrollContentBackground(.hidden)
                         .padding(.horizontal, 4)
+                        .accessibilityIdentifier(AccessibilityID.NoteEditor.textEditor)
 
                     // Character count
                     HStack {
@@ -63,6 +64,7 @@ struct NoteEditorView: View {
                     Button("Cancel") {
                         dismiss()
                     }
+                    .accessibilityIdentifier(AccessibilityID.NoteEditor.cancelButton)
                 }
 
                 ToolbarItem(placement: .confirmationAction) {
@@ -71,6 +73,7 @@ struct NoteEditorView: View {
                     }
                     .disabled(isSaving || noteText.count > maxCharacters)
                     .fontWeight(.semibold)
+                    .accessibilityIdentifier(AccessibilityID.NoteEditor.saveButton)
                 }
 
                 ToolbarItemGroup(placement: .keyboard) {
@@ -197,11 +200,13 @@ struct EntryDetailView: View {
             .background(Color(.systemGroupedBackground))
             .navigationTitle("Entry Details")
             .navigationBarTitleDisplayMode(.inline)
+            .accessibilityIdentifier(AccessibilityID.EntryDetail.sheet)
             .toolbar {
                 ToolbarItem(placement: .confirmationAction) {
                     Button("Done") {
                         dismiss()
                     }
+                    .accessibilityIdentifier(AccessibilityID.EntryDetail.doneButton)
                 }
             }
             .sheet(isPresented: $showNoteEditor) {
@@ -345,6 +350,7 @@ struct EntryDetailView: View {
                 RoundedRectangle(cornerRadius: 16)
                     .fill(Color(.systemBackground))
             )
+            .accessibilityIdentifier(AccessibilityID.EntryDetail.moodGrid)
         }
     }
 
@@ -364,6 +370,7 @@ struct EntryDetailView: View {
                         .font(.subheadline)
                         .fontWeight(.medium)
                 }
+                .accessibilityIdentifier(AccessibilityID.EntryDetail.noteButton)
             }
 
             Button {
@@ -399,6 +406,7 @@ struct EntryDetailView: View {
                 )
             }
             .buttonStyle(.plain)
+            .accessibilityIdentifier(AccessibilityID.EntryDetail.noteArea)
         }
     }
 
@@ -495,6 +503,7 @@ struct EntryDetailView: View {
             )
         }
         .padding(.top, 8)
+        .accessibilityIdentifier(AccessibilityID.EntryDetail.deleteButton)
     }
 }