Preserve report page aspect ratio in PNG wireframe rendering

[Copilot]

PNG wireframes were always rendered at a fixed 16:9 size, which distorted report pages that use custom dimensions. This change keeps the rendered height fixed at 720 while deriving the output width and visual layout from each page’s actual aspect ratio.

• Renderer input

  • Extend wireframe rendering to receive the inspected report path so page metadata can be resolved from the source report definition.

• Page-size aware scaling

  • Read each page’s width and height from page.json.
  • Compute a uniform scale factor from the source page height to the fixed rendered height.
  • Apply that scale factor to:
    • output page width
    • visual x / y
    • visual width / height

• Cross-library parity

  • Apply the same scaling behavior in both:
    • FabInspector.ImageLibrary
    • FabInspector.WinImageLibrary

• Regression coverage

  • Add coverage for a non-16:9 page fixture to verify the generated PNG dimensions reflect the source page aspect ratio.
  • Update PNG writer tests/stubs for the renderer signature change.

var sourcePageSize = GetPageSize(pageName, pageSizes);
var scale = (decimal)DefaultPageHeight / sourcePageSize.Height;

var pageSize = new ReportPage.PageSize
{
    Height = DefaultPageHeight,
    Width = (int)Math.Round(sourcePageSize.Width * scale)
};

var x = ScaleValue(f["x"]!.GetValue<decimal>(), scale);
var y = ScaleValue(f["y"]!.GetValue<decimal>(), scale);
var width = ScaleValue(f["width"]!.GetValue<decimal>(), scale);
var height = ScaleValue(f["height"]!.GetValue<decimal>(), scale);