Fix test naming inconsistencies, variable name shadowing, tag mismatch, and nullable warning in ListWidget

[Copilot]

Several copy-paste errors and code quality issues identified across test files and a core widget component.

Test method/variable naming fixes

• GraphWidgetTest — both test methods were named CommentsWidget* (copy-paste from CommentsWidgetTest)
• IFrameWidgetTest — method names had a spurious k (IFramekWidget*); local variable IFrameWidget shadowed the type name → renamed to iFrameWidget
• ImageWidgetTest — second method named ClockWidgetShouldContainPassedInValues instead of ImageWidgetShouldContainPassedInValues
• CommentsWidgetTest / ListWidgetTest — instance variables named textWidget in both; ListWidgetTest methods also named TextWidget*

Markup correctness

• CircleCIBuildStatusWidgetTest — expected markup for <h2 class="state"> had a mismatched </h1> closing tag

Nullable warning (ListWidget.razor)

Items is declared List<...>? but iterated directly, producing two CS8602 warnings. Fixed with a null-coalescing fallback:

@foreach (var item in Items ?? Enumerable.Empty<(string label, string value)>())

Original prompt

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