Centralize retained UI GL dispatch

docs/modernization/build-inventory.md

@@ -540,8 +540,8 @@ powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.p
   clear-color restore, active texture unit execution, fallback 2D texture
   unbinds, 2D texture targets, copy targets, and sampler filters/wraps. Its
   live stroke-mixer and brush-preview viewport, scissor, and depth/blend state
-  changes now execute through tested `pp_renderer_gl` dispatch with only local
-  OpenGL adapter endpoints retained.
+  changes now execute through tested `pp_renderer_gl` dispatch via the shared
+  `legacy_ui_gl_dispatch` bridge.
   Retained `Canvas` stroke/thumbnail/object/export paths and `NodeCanvas`
   panorama rendering use the same tested active-texture dispatch for
   texture-unit switches, and their live viewport, scissor, and generic
@@ -552,7 +552,10 @@ powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.p
   clear-color query plus clear-color restore paths also use tested
   `pp_renderer_gl` dispatch helpers. `NodeCanvas` saved viewport/clear-color
   query, density/offscreen color clear, and clear-color restore paths use the
-  same helpers. Retained desktop HMD eye rendering also routes viewport
+  same helpers. `NodeCanvas` and `NodeStrokePreview` now share
+  `legacy_ui_gl_dispatch` for active texture, texture unbind, viewport/scissor,
+  clear-color, color-buffer clear, and capability query/apply adapter endpoints.
+  Retained desktop HMD eye rendering also routes viewport
   execution through tested backend dispatch.
   Legacy `Texture2D`, `TextureManager`, `Sampler`, and `RTT` public headers no
   longer expose raw OpenGL enum defaults; default texture formats, sampler
@@ -855,6 +858,9 @@ powershell -ExecutionPolicy Bypass -File scripts\automation\apple-remote-build.p
   `NodeImageTexture`, `NodeColorWheel`, `NodeAnimationTimeline`, `NodeScroll`,
   `NodeText`, `NodeTextInput`, and `NodeViewport` blend-state, fallback
   texture unbind, viewport, color clear, and clear-color restore paths,
+  plus retained `NodeCanvas` and `NodeStrokePreview` active-texture, fallback
+  texture unbind, viewport/scissor, clear-color, color-buffer clear, and
+  capability query/apply draw-state adapter endpoints,
   tested convert-command state dispatch consumed by
   `App::cmd_convert`, tested render platform hint dispatch consumed by
   `WindowsPlatformServices` and the retained macOS legacy fallback, tested

docs/modernization/roadmap.md

@@ -1252,8 +1252,8 @@ texture unit execution, fallback 2D texture unbinds, 2D texture targets, copy
 targets, sampler filters/wraps, and destination-feedback copy/fetch decisions
 to `pp_renderer_gl` and `pp_paint_renderer`. Its live stroke-mixer and
 brush-preview viewport, scissor, and depth/blend state changes now also
-execute through tested `pp_renderer_gl` dispatch with only local OpenGL adapter
-endpoints retained.
+execute through tested `pp_renderer_gl` dispatch via the shared
+`legacy_ui_gl_dispatch` bridge.
 Retained `Canvas` stroke/thumbnail/object/export paths and `NodeCanvas`
 panorama rendering use the same tested active-texture dispatch for their
 texture-unit switches, and their live viewport, scissor, and generic
@@ -1263,7 +1263,10 @@ snapshots now route through the same backend dispatch contracts. Retained
 generation, object drawing, and `LayerFrame::clear` saved viewport/clear-color
 query plus clear-color restore paths also use tested `pp_renderer_gl` dispatch
 helpers. `NodeCanvas` saved viewport/clear-color query, density target color
-clear, and clear-color restore paths use the same helpers.
+clear, and clear-color restore paths use the same helpers. `NodeCanvas` and
+`NodeStrokePreview` now share that retained UI GL dispatch bridge for
+active-texture, fallback texture unbind, viewport/scissor, clear-color,
+color-buffer clear, and capability query/apply adapter endpoints.
 Desktop HMD eye rendering now routes eye framebuffer viewport changes through
 the tested `pp_renderer_gl` viewport dispatch while platform VR SDK bridges
 remain isolated for later platform-shell extraction.
@@ -2504,7 +2507,11 @@ Results:
 - Retained paint UI surface paths now use tested `pp_renderer_gl` viewport
   query, clear-color query, clear-color restore, and color-buffer clear helpers
   in `NodeCanvas` and `NodeStrokePreview`, removing direct query/clear calls
-  from those draw bodies while keeping their legacy compositing order.
+  from those draw bodies while keeping their legacy compositing order. Their
+  active-texture, fallback texture unbind, viewport/scissor, clear-color,
+  color-buffer clear, and capability query/apply adapter endpoints are now
+  centralized in `legacy_ui_gl_dispatch` instead of being duplicated in each
+  node implementation.
 - Retained Canvas stroke draw/commit, thumbnail, object-render, and
   `LayerFrame::clear` paths now use the same tested backend viewport query,
   clear-color query, and clear-color restore helpers, removing direct