flutter_scene 0.24.1

• On Apple platforms, a ShaderMaterial whose fragment shader reads a varying its vertex shader does not write at that location and type is skipped with a message naming the varying, instead of crashing the app on Flutter 3.47. Scene.preload also waits for the shader reflection the check reads.
• An alpha-masked or LOD cross-fading mesh whose layers overlap shades its nearest layer again, instead of leaving a hole wherever a farther layer comes first in its index order. Regressed in 0.24.0.
• Lit, unlit, and .fmat shaders build about twice as fast in browsers on Windows, close to 0.23, where a new material could stall its first frame for tens of seconds. Regressed in 0.24.0.
• The surface debug views' material channels are compiled in only when the app sets hooks: user_defines: flutter_scene: debug_views: true (plus flutter_scene_debug_views: true under the app's name if its hook builds materials or engine assets). Without it a view shows the geometry and identity channels and prints how to turn the rest on.
• buildMaterials and buildEngineAssets take debugViews.