Improve vision encoder casts for WebGPU

onnx/vision_encoder.onnx

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onnx/vision_encoder_bnb4.onnx

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onnx/vision_encoder_fp16.onnx

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onnx/vision_encoder_int8.onnx

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onnx/vision_encoder_q4.onnx

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onnx/vision_encoder_quantized.onnx

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onnx/vision_encoder_uint8.onnx

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