Sigil 0.2.8.18

Fixed

• Time uniform not updating in WebGPU render loop: Fixed animation by unifying the render loop
  • Previously had TWO separate requestAnimationFrame loops: Materia's RenderLoop for uniform updates and our animate() for rendering
  • Uniform updates and rendering were desynchronized, causing uniforms.time to stay at 0
  • Now uses a single unified render loop that:
    1. Calculates elapsed time from requestAnimationFrame timestamp
    2. Updates uniforms with current time/deltaTime BEFORE rendering
    3. Renders the frame
  • Removed unused RenderLoop import and field