Route remaining UI shader setup through helpers

docs/modernization/roadmap.md

@@ -3068,6 +3068,10 @@ Results:
 - Scrollbar, text-input, and VR frame/cursor/controller shader setup now share
   retained UI/preview helpers, while geometry, blend/depth state,
   sampler/texture binding, and draw execution remain retained.
+- Remaining simple color, hue, color-quad, grid heightmap, and pen/line
+  preview shader setup in UI nodes and canvas modes now shares retained helper
+  surfaces, while geometry, texture/sampler binding, blend/depth state,
+  readback, and draw execution remain retained.
 - `NodeCanvas` density-resolve drawing and desktop VR UI drawing now share the
   retained draw-merge texture shader setup helper, while render target,
   sampler/texture binding, viewport/state restoration, and draw execution