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/NotesTests.swift

@@ -0,0 +1,132 @@
+//
+//  NotesTests.swift
+//  Tests iOS
+//
+//  Notes add/edit and emoji support tests.
+//
+
+import XCTest
+
+final class NotesTests: BaseUITestCase {
+    override var seedFixture: String? { "single_mood" }
+
+    /// TC-026 / TC-132: Add a note to an existing entry.
+    func testAddNote_ToExistingEntry() {
+        // Open entry detail
+        let firstEntry = app.descendants(matching: .any)
+            .matching(NSPredicate(format: "identifier BEGINSWITH %@", "entry_row_"))
+            .firstMatch
+        guard firstEntry.waitForExistence(timeout: 8) else {
+            XCTFail("No entry row found")
+            return
+        }
+        firstEntry.tap()
+
+        let detailScreen = EntryDetailScreen(app: app)
+        detailScreen.assertVisible()
+
+        // Tap the note area to open the note editor
+        let noteArea = app.buttons["entry_detail_note_area"]
+        if !noteArea.waitForExistence(timeout: 3) {
+            // Try the note button instead
+            let noteButton = app.buttons["entry_detail_note_button"]
+            guard noteButton.waitForExistence(timeout: 3) else {
+                XCTFail("Neither note area nor note button found")
+                return
+            }
+            noteButton.tap()
+        } else {
+            noteArea.tap()
+        }
+
+        // Note editor should appear
+        let noteEditorTitle = app.navigationBars["Journal Note"]
+        XCTAssertTrue(
+            noteEditorTitle.waitForExistence(timeout: 5),
+            "Note editor should be visible"
+        )
+
+        // Type a note
+        let textEditor = app.textViews["note_editor_text"]
+        if textEditor.waitForExistence(timeout: 3) {
+            textEditor.tap()
+            textEditor.typeText("Had a great day today!")
+        }
+
+        captureScreenshot(name: "note_typed")
+
+        // Save the note
+        let saveButton = app.buttons["Save"]
+        saveButton.tapWhenReady()
+
+        // Note editor should dismiss
+        XCTAssertTrue(
+            noteEditorTitle.waitForDisappearance(timeout: 5),
+            "Note editor should dismiss after save"
+        )
+
+        // Verify the note text is visible in the detail view
+        let noteText = app.staticTexts.matching(NSPredicate(format: "label CONTAINS %@", "Had a great day today!")).firstMatch
+        XCTAssertTrue(
+            noteText.waitForExistence(timeout: 5),
+            "Saved note text should be visible in entry detail"
+        )
+
+        captureScreenshot(name: "note_saved")
+
+        // Dismiss detail
+        detailScreen.dismiss()
+        detailScreen.assertDismissed()
+    }
+
+    /// TC-135: Add a note with emoji and special characters.
+    func testAddNote_WithEmoji() {
+        let firstEntry = app.descendants(matching: .any)
+            .matching(NSPredicate(format: "identifier BEGINSWITH %@", "entry_row_"))
+            .firstMatch
+        guard firstEntry.waitForExistence(timeout: 8) else {
+            XCTFail("No entry row found")
+            return
+        }
+        firstEntry.tap()
+
+        let detailScreen = EntryDetailScreen(app: app)
+        detailScreen.assertVisible()
+
+        // Open note editor
+        let noteArea = app.buttons["entry_detail_note_area"]
+        if noteArea.waitForExistence(timeout: 3) {
+            noteArea.tap()
+        } else {
+            let noteButton = app.buttons["entry_detail_note_button"]
+            noteButton.tapWhenReady()
+        }
+
+        let noteEditorTitle = app.navigationBars["Journal Note"]
+        XCTAssertTrue(
+            noteEditorTitle.waitForExistence(timeout: 5),
+            "Note editor should be visible"
+        )
+
+        // Type emoji text - note: XCUITest typeText supports Unicode
+        let textEditor = app.textViews["note_editor_text"]
+        if textEditor.waitForExistence(timeout: 3) {
+            textEditor.tap()
+            textEditor.typeText("Feeling amazing! 100")
+        }
+
+        // Save
+        let saveButton = app.buttons["Save"]
+        saveButton.tapWhenReady()
+
+        XCTAssertTrue(
+            noteEditorTitle.waitForDisappearance(timeout: 5),
+            "Note editor should dismiss after save"
+        )
+
+        captureScreenshot(name: "note_with_special_chars")
+
+        detailScreen.dismiss()
+        detailScreen.assertDismissed()
+    }
+}