Use CanvasContext setter for device pixels

[ibgreen]

Summary

• update Deck setProps to route device pixel changes through CanvasContext
• remove manual synthetic resize handling in favor of CanvasContext APIs

Testing

• not run (not requested)

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Codex Task

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Note

Routes useDevicePixels changes through canvasContext.setProps instead of manually tweaking canvas and simulating a resize.

• Core (modules/core/src/lib/deck.ts):
  • Route useDevicePixels updates via device.canvasContext.setProps({useDevicePixels}).
  • Remove manual canvas property mutation and synthetic resize handling.

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