Thin node loader, Win32 wrappers, and canvas mode shells

docs/modernization/roadmap.md

@@ -81,9 +81,9 @@ Current hotspot files:
 
 - `src/canvas.cpp`: 17 lines
 - `src/app_layout.cpp`: 125 lines
-- `src/canvas_modes.cpp`: 191 lines
-- `src/node.cpp`: 257 lines
-- `src/main.cpp`: 156 lines
+- `src/canvas_modes.cpp`: 1 line
+- `src/node.cpp`: 231 lines
+- `src/main.cpp`: 87 lines
 - `src/node_panel_brush.cpp`: 2 lines
 - `src/node_stroke_preview.cpp`: 160 lines
 - `src/node_canvas.cpp`: 85 lines
@@ -131,6 +131,16 @@ Latest slice:
   `src/legacy_brush_preset_list_services.*`, and
   `src/legacy_brush_preset_services.*`), leaving
   `src/node_panel_brush.cpp` as a thin translation unit.
+- `Node::load_internal(...)` now routes through
+  `load_legacy_ui_node(...)` in `src/legacy_ui_node_loader.*`, which moves the
+  init/attribute-parse/create/child-load/loaded shell out of `src/node.cpp`.
+- The remaining Win32 shell wrappers for close, async lock/swap, stylus/FPS
+  updates, VR start/stop, window-state save, and the window-handle accessor now
+  live in `src/platform_windows/windows_platform_services.cpp` instead of
+  `src/main.cpp`, leaving `main.cpp` as a thinner entry/runtime dispatcher.
+- The entire `CanvasModeGrid` implementation plus `ActionModeGrid` undo/redo
+  glue now live in `src/legacy_canvas_mode_helpers.cpp` instead of
+  `src/canvas_modes.cpp`, leaving `src/canvas_modes.cpp` as a minimal shell.
 
 Current architecture mismatches that must be treated as real blockers:
 

docs/modernization/tasks.md

@@ -391,6 +391,10 @@ Current slice:
   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.
+- `CanvasModeGrid` plus `ActionModeGrid` undo/redo now also live in
+  `src/legacy_canvas_mode_helpers.cpp` instead of staying inline in
+  `src/canvas_modes.cpp`, which leaves the live canvas-modes file as a
+  minimal 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
@@ -908,6 +912,10 @@ Current slice:
   base clone plumbing now also lives in `src/legacy_ui_node_lifecycle.*`
   instead of staying inline in `src/node.cpp`, which materially thins another
   coherent generic scene-graph shell without changing the public surface.
+- `Node::load_internal(...)` now also routes through
+  `load_legacy_ui_node(...)` in `src/legacy_ui_node_loader.*`, which moves the
+  init/attribute-parse/create/child-load/loaded shell out of `src/node.cpp`
+  and leaves the remaining live node file thinner.
 
 Write scope:
 - `src/node.cpp`
@@ -1090,6 +1098,12 @@ Current slice:
   directly in those method bodies
 - retained Apple callback injection and broader `platform_legacy` singleton
   reach are still open
+- The remaining Win32 shell wrappers for close, async lock/swap,
+  stylus/FPS updates, VR start/stop, window-state save, and the
+  window-handle accessor now live in
+  `src/platform_windows/windows_platform_services.cpp` instead of
+  `src/main.cpp`, which leaves the live entry file as a thinner
+  startup/runtime dispatcher.
 
 Write scope:
 - `src/platform_apple/*`