Thin brush panel, preview, and node utility shells

docs/modernization/roadmap.md

@@ -81,14 +81,14 @@ Current hotspot files:
 
 - `src/canvas.cpp`: 17 lines
 - `src/app_layout.cpp`: 125 lines
-- `src/canvas_modes.cpp`: 176 lines
-- `src/node.cpp`: 222 lines
-- `src/main.cpp`: 130 lines
-- `src/node_panel_brush.cpp`: 182 lines
-- `src/node_stroke_preview.cpp`: 192 lines
-- `src/node_canvas.cpp`: 69 lines
-- `src/app.cpp`: 105 lines
-- `src/app_dialogs.cpp`: 106 lines
+- `src/canvas_modes.cpp`: 191 lines
+- `src/node.cpp`: 257 lines
+- `src/main.cpp`: 156 lines
+- `src/node_panel_brush.cpp`: 2 lines
+- `src/node_stroke_preview.cpp`: 160 lines
+- `src/node_canvas.cpp`: 85 lines
+- `src/app.cpp`: 125 lines
+- `src/app_dialogs.cpp`: 127 lines
 
 Latest slice:
 
@@ -115,6 +115,22 @@ Latest slice:
   `SetMinSize(...)`, `SetMaxSize(...)`, and `SetPosition(const glm::vec2)` now
   lives in `src/legacy_ui_node_style.*` instead of staying inline in
   `src/node.cpp`.
+- `Node::app_redraw()` and `Node::watch(...)` now live in
+  `src/legacy_ui_node_execution.cpp` instead of staying inline in `src/node.cpp`.
+- `NodeStrokePreview::draw_stroke_immediate()` now 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.
+- The remaining `NodePanelBrush` and `NodePanelBrushPreset` member bodies now
+  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.*`), leaving
+  `src/node_panel_brush.cpp` as a thin translation unit.
 
 Current architecture mismatches that must be treated as real blockers: