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ukimsanov
a78e49c181
Allow omitting the shader field in TransitionConfig to get a smooth CSS opacity crossfade instead of a WebGL effect. HyperShader manages all scene visibility regardless of transition type, so shader and CSS crossfade transitions can now be mixed freely in the same composition. When shader is omitted: - No WebGL program is compiled or cached for that transition - The existing applyFallbackTransition() path handles the crossfade - No texture prewarming needed — transition is marked ready immediately Tested: verified with a 3-scene composition (sdf-iris + CSS crossfade) rendered to MP4. Both transition types render correctly. engine/src/types.ts: HfTransitionMeta.shader is now optional to match