Add comprehensive tests for Canvas width and height props

[Copilot]

This PR adds comprehensive test coverage for the new width and height props added to the Canvas component, ensuring proper sizing behavior and backward compatibility.

What was tested

The tests verify that the Canvas component correctly handles manual sizing through the new props:

1. Manual sizing: When both width and height props are provided, the canvas element uses those exact dimensions
2. Partial sizing fallback: When only one dimension is provided (width OR height), the component falls back to useMeasure
3. Default behavior: When neither prop is provided, the existing useMeasure logic continues to work as before

Test cases added

// Manual sizing - uses provided dimensions
<Canvas width={640} height={480}>
  <group />
</Canvas>
// ✓ Canvas has width="640" height="480"

// Partial sizing - falls back to useMeasure
<Canvas width={640}>
  <group />
</Canvas>
// ✓ Canvas uses mocked useMeasure dimensions (1280x800)

// Default behavior - existing useMeasure logic
<Canvas>
  <group />
</Canvas>
// ✓ Canvas uses mocked useMeasure dimensions (1280x800)

Implementation details

• All tests use the existing @testing-library/react setup and patterns
• Tests verify actual DOM attributes using canvas?.getAttribute('width')
• Leverages the existing react-use-measure mock that returns fixed 1280x800 dimensions
• Added 4 new test cases to the existing canvas.test.tsx file
• All tests pass and maintain backward compatibility

This ensures that the new manual sizing feature works correctly while preserving the existing responsive behavior when manual dimensions are not provided.

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[abernier]

see comments

[Copilot]

see comments

Removed hard-coded dimension values by exporting them from the react-use-measure mock and importing them in the tests. This ensures the test values always match the actual mock implementation. (f9ff27c)

[abernier]

lgtm