Route UI and VR shader setup through helpers

docs/modernization/debt.md

@@ -18,6 +18,10 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Recent Reductions
 
+- 2026-06-13: DEBT-0036 was narrowed again. Scrollbar, text-input, and VR
+  frame/cursor/controller shader setup now routes through retained UI/preview
+  helpers; those paths still own geometry, blend/depth state, sampler/texture
+  binding, and draw execution.
 - 2026-06-13: DEBT-0036 was narrowed again. Depth export `TextureColorize`
   shader setup now routes through `legacy_canvas_draw_merge_services.h`; the
   export path still owns sampler/texture binding, layer color selection, and

docs/modernization/roadmap.md

@@ -3065,6 +3065,9 @@ Results:
 - Slider `Color` and `ColorHue` setup now shares retained UI overlay helpers,
   while slider geometry, hue direction, border drawing, and draw execution
   remain retained.
+- 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.
 - `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