Replace non-waiting Assert.True(await locator.IsVisibleAsync()) checks with
auto-retrying Assertions.Expect(locator).ToBeVisibleAsync()/ToBeHiddenAsync()
to remove flakiness against Blazor's async rendering. Table-row/field page
objects (Metadata/Roles/Users/Profile) now expose ILocator helpers instead of
Task<bool>, so deletion checks wait for the element to disappear.
Also: rename ScreenshotHelper.CaptureIfFailedAsync to CaptureAsync (xUnit v2
cannot expose the test outcome to DisposeAsync, so it always captures the final
page state), drop the unused TestConstants.ServerPort/BaseUrl now that ports
bind dynamically, and fix IClassFixture doc comments to ICollectionFixture.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>