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/ScheduleTests.swift

@@ -0,0 +1,24 @@
+//
+//  ScheduleTests.swift
+//  SportsTimeUITests
+//
+//  Verifies the Schedule tab loads and displays content.
+//
+
+import XCTest
+
+final class ScheduleTests: BaseUITestCase {
+
+    /// Verifies the schedule tab loads and shows content.
+    @MainActor
+    func testScheduleTabLoads() {
+        let home = HomeScreen(app: app)
+        home.waitForLoad()
+        home.switchToTab(home.scheduleTab)
+
+        let schedule = ScheduleScreen(app: app)
+        schedule.assertLoaded()
+
+        captureScreenshot(named: "Schedule-Loaded")
+    }
+}