Extract canvas mask modes, preview draw pass, and node style shell

docs/modernization/tasks.md

@@ -152,6 +152,10 @@ Current slice:
   in `src/legacy_canvas_mode_pen_line.cpp` instead of staying inline in
   `src/canvas_modes.cpp`, which materially thins another retained pen/line
   interaction pocket from the broader canvas/render hotspot family.
+- The `CanvasModeMaskFree` and `CanvasModeMaskLine` interaction families now
+  also live in `src/legacy_canvas_mode_mask.cpp` instead of staying inline in
+  `src/canvas_modes.cpp`, which materially thins another retained mask-tool
+  interaction pocket from the broader canvas/render hotspot family.
 
 Write scope:
 - `src/canvas.cpp`
@@ -326,6 +330,11 @@ Current slice:
   inline in `src/node_stroke_preview.cpp`, which materially thins the preview
   node around its runtime-facing shell even though live pass execution still
   remains.
+- The remaining live render/pass orchestration in
+  `NodeStrokePreview::draw_stroke_immediate()` now also lives in
+  `src/legacy_node_stroke_preview_draw_services.*` instead of staying inline in
+  `src/node_stroke_preview.cpp`, which trims another coherent preview
+  draw-pass pocket while preserving the current runtime-facing shell.
 - `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
@@ -778,6 +787,10 @@ Current slice:
   `src/legacy_ui_node_tree_services.cpp` instead of staying inline in
   `src/node.cpp`, which materially thins the remaining generic scene-graph
   lifecycle/tree shell without changing the public surface.
+- The generic Yoga style/visibility pocket from `Node::SetWidth(...)` through
+  `Node::GetRTL()` now also lives in `src/legacy_ui_node_style.*` instead of
+  staying inline in `src/node.cpp`, which trims another coherent generic node
+  shell pocket without changing the public surface.
 
 Write scope:
 - `src/node.cpp`