Harden test harness and UI suite

SportsTimeUITests/Framework/BaseUITestCase.swift

@@ -59,6 +59,33 @@ class BaseUITestCase: XCTestCase {
         screenshot.lifetime = .keepAlways
         add(screenshot)
     }
+
+    /// Polls until the condition becomes true or the timeout expires.
+    @discardableResult
+    func waitUntil(
+        timeout: TimeInterval = BaseUITestCase.defaultTimeout,
+        pollInterval: TimeInterval = 0.2,
+        _ message: String? = nil,
+        file: StaticString = #filePath,
+        line: UInt = #line,
+        condition: @escaping () -> Bool
+    ) -> Bool {
+        let deadline = Date().addingTimeInterval(timeout)
+
+        while Date() < deadline {
+            if condition() {
+                return true
+            }
+
+            let remaining = deadline.timeIntervalSinceNow
+            let interval = min(pollInterval, max(0.01, remaining))
+            RunLoop.current.run(until: Date().addingTimeInterval(interval))
+        }
+
+        let success = condition()
+        XCTAssertTrue(success, message ?? "Condition was not met within \(timeout)s", file: file, line: line)
+        return success
+    }
 }
 
 // MARK: - Wait Helpers