BlazorCanvas2d gradient error

[Zettersten]

Sanitize non-finite numeric arguments for canvas gradient creation methods in JS to prevent JSException crashes.

The Blazor demo was crashing due to Microsoft.JSInterop.JSException: Failed to execute 'createLinearGradient' on 'CanvasRenderingContext2D': The provided double value is non-finite. This occurred when NaN or Infinity values were passed from .NET to JavaScript for gradient coordinates, causing the browser's canvas API to throw an error and halt the render loop. This fix coerces such non-finite numbers to 0 before invoking the canvas API.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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