Function metersToPixels

Convert physics position (meters) to screen position (pixels).

IMPORTANT: Only handles scaling conversion between meters and pixels. Does NOT account for arena position offsets (bounds.x and bounds.y). Callers must add these offsets separately when rendering to screen.

Example:

const pixelPos = metersToPixels(physicsPos, bounds);
const screenX = bounds.x + pixelPos.x;  // Add arena offset
const screenY = bounds.y + pixelPos.y;  // Add arena offset
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Korean: 미터를픽셀로 (Meters To Pixels)