feat: add XCUITest suite with 10 critical flow tests and QA test plan

Add comprehensive UI test infrastructure with Page Object pattern,
accessibility identifiers, UI test mode (--ui-testing, --reset-state,
--disable-animations), and 10 passing tests covering app launch, tab
navigation, trip wizard, trip saving, settings, schedule, and
accessibility at XXXL Dynamic Type. Also adds a 229-case QA test plan
Excel workbook for manual QA handoff.

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

SportsTimeUITests/Tests/AccessibilityTests.swift

@@ -0,0 +1,46 @@
+//
+//  AccessibilityTests.swift
+//  SportsTimeUITests
+//
+//  Smoke test for Dynamic Type accessibility at XXXL text size.
+//
+
+import XCTest
+
+final class AccessibilityTests: BaseUITestCase {
+
+    /// Verifies the entry flow is usable at AX XXL text size.
+    @MainActor
+    func testLargeDynamicTypeEntryFlow() {
+        // Re-launch with large Dynamic Type
+        app.terminate()
+        app.launchArguments = [
+            "--ui-testing",
+            "--disable-animations",
+            "--reset-state",
+            "-UIPreferredContentSizeCategoryName",
+            "UICTContentSizeCategoryAccessibilityXXXL"
+        ]
+        app.launch()
+
+        let home = HomeScreen(app: app)
+        home.waitForLoad()
+
+        // At XXXL text the button may be pushed below the fold; scroll into view
+        home.startPlanningButton.scrollIntoView(in: app.scrollViews.firstMatch)
+        XCTAssertTrue(home.startPlanningButton.isHittable,
+                       "Start Planning should remain hittable at large Dynamic Type")
+
+        // Open wizard and verify planning mode options are reachable
+        home.tapStartPlanning()
+        let wizard = TripWizardScreen(app: app)
+        wizard.waitForLoad()
+
+        let dateRangeMode = wizard.planningModeButton("dateRange")
+        dateRangeMode.scrollIntoView(in: app.scrollViews.firstMatch)
+        XCTAssertTrue(dateRangeMode.isHittable,
+                       "Planning mode should be hittable at large Dynamic Type")
+
+        captureScreenshot(named: "Accessibility-LargeType")
+    }
+}