Add semantic status parameters to ServerStatusSquareWidget and CircleCIBuildStatusWidget

[Copilot]

Both widgets required callers to manually specify hex BackgroundColor to convey status — losing the semantic intent and duplicating magic strings across usages.

Changes

ServerStatusSquareWidget — new Result parameter

• bool? Result: true → green (#96BF48), false → red (#BF4848)
• Explicit BackgroundColor still takes precedence

<ServerStatusSquareWidget Title="API Gateway" Result="true" />
<ServerStatusSquareWidget Title="Auth Service" Result="false" />

CircleCIBuildStatusWidget — new WidgetClass parameter

• Added CircleCIWidgetClass enum: Failed / Pending / Passed
• Maps to the background colors already defined in the existing CSS (.widget-circle-ci.failed, etc.)
• Explicit BackgroundColor still takes precedence

<CircleCIBuildStatusWidget Title="Payment Service" State="FAILED" WidgetClass="@CircleCIWidgetClass.Failed" />

ListWidget — nullable fix

• Replaced direct iteration over Items with Items ?? Enumerable.Empty<...>() to eliminate CS8602 warnings

Tests & stories updated

• New test cases cover status→color mapping and BackgroundColor override precedence
• Stories updated to use the new parameters in place of raw hex values

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