Move stroke preview render mapping to renderer gl

docs/modernization/build-inventory.md

@@ -189,6 +189,9 @@ Known local toolchain state:
   Legacy `util.cpp` OpenGL error naming and `gl_state` save/restore also
   consume backend-owned error codes, state queries, framebuffer targets,
   texture binding targets, and active texture units.
+  `NodeStrokePreview` brush preview rendering also consumes backend-owned
+  depth/scissor/blend state, viewport/clear-color queries, active texture
+  units, 2D texture targets, copy targets, and sampler filters/wraps.
 - `windows-msvc-vcpkg-headless` validates manifest install/configure/build/test
   for the current headless component matrix; see DEBT-0007 for remaining app
   and platform triplet migration.

docs/modernization/roadmap.md

@@ -456,6 +456,9 @@ formats to `pp_renderer_gl`.
 Legacy `util.cpp` OpenGL error naming and `gl_state` save/restore now delegate
 error codes, state queries, framebuffer targets, texture binding targets, and
 active texture units to `pp_renderer_gl`.
+`NodeStrokePreview` brush preview rendering now delegates depth/scissor/blend
+state, viewport/clear-color queries, active texture units, 2D texture targets,
+copy targets, and sampler filters/wraps to `pp_renderer_gl`.
 The existing renderer classes are not yet fully
 behind the renderer interfaces.