Function run_morph_passes 

pub fn run_morph_passes(
    idx: usize,
    meta: &MorphMeta,
    pipeline_cache: &PipelineCache,
    ctx: &mut RenderContext<'_, '_>,
)

Execute one layer’s staged morph pass inside the capture-pass encoder: capture (already rendered) + snapshot → blend. Called per layer from ui_layer_capture_pass, after the capture, before the regular filter replay (which sources the blend).