Thin brush panel, preview, and node utility shells

docs/modernization/tasks.md

@@ -385,6 +385,12 @@ Current slice:
   `src/legacy_node_stroke_preview_sample_services.*` instead of staying inline
   in `src/node_stroke_preview.cpp`, which trims another coherent preview
   execution pocket while preserving the live draw path.
+- `NodeStrokePreview::draw_stroke_immediate()` now also routes through
+  `execute_legacy_node_stroke_preview_immediate_draw(...)` in
+  `src/legacy_node_stroke_preview_runtime_services.*`, which moves
+  render-target validation, viewport/clear-color save-restore, and immediate
+  runtime request assembly out of the live node file and leaves
+  `src/node_stroke_preview.cpp` at 160 lines.
 - `NodeCanvas::init()` plus the remaining `NodeCanvas::draw()` outer shell now
   also live in `src/legacy_node_canvas_draw_services.*` instead of staying
   inline in `src/node_canvas.cpp`, which materially reduces the live node to a
@@ -394,10 +400,22 @@ Current slice:
   now also lives in `src/legacy_ui_node_style.*` instead of staying inline in
   `src/node.cpp`, which trims another coherent base scene-graph shell pocket
   without changing the public surface.
+- `Node::app_redraw()` and `Node::watch(...)` now also live in
+  `src/legacy_ui_node_execution.cpp` instead of staying inline in `src/node.cpp`,
+  which trims another small generic node utility pocket from the live file.
 - `NodePanelBrushPreset` global panel registration now also lives in
   `src/legacy_brush_preset_list_services.*` instead of staying on the live
   node type as a static registry field, which trims another retained
   controller-state pocket from `src/node_panel_brush.cpp`.
+- The remaining `NodePanelBrush` and `NodePanelBrushPreset` member bodies now
+  also live in the existing retained helper layers
+  (`src/legacy_brush_panel_item_ui.*`,
+  `src/legacy_brush_panel_ui.*`,
+  `src/legacy_brush_panel_services.*`,
+  `src/legacy_brush_preset_panel_ui.*`,
+  `src/legacy_brush_preset_list_services.*`, and
+  `src/legacy_brush_preset_services.*`), which leaves
+  `src/node_panel_brush.cpp` as a 2-line translation unit.
 
 Write scope:
 - `src/node_stroke_preview.cpp`