Extract node canvas events and preview/node geometry shells

docs/modernization/roadmap.md

@@ -82,14 +82,29 @@ Current hotspot files:
 - `src/canvas.cpp`: 17 lines
 - `src/app_layout.cpp`: 125 lines
 - `src/canvas_modes.cpp`: 176 lines
-- `src/node.cpp`: 260 lines
+- `src/node.cpp`: 222 lines
 - `src/main.cpp`: 130 lines
 - `src/node_panel_brush.cpp`: 189 lines
-- `src/node_stroke_preview.cpp`: 280 lines
-- `src/node_canvas.cpp`: 219 lines
+- `src/node_stroke_preview.cpp`: 192 lines
+- `src/node_canvas.cpp`: 69 lines
 - `src/app.cpp`: 113 lines
 - `src/app_dialogs.cpp`: 168 lines
 
+Latest slice:
+
+- `NodeCanvas::handle_event()` now routes through
+  `handle_legacy_node_canvas_event(...)` in
+  `src/legacy_canvas_tool_services.*`, leaving `src/node_canvas.cpp` as a much
+  thinner controller shell.
+- The remaining low-level `NodeStrokePreview` viewport/query and texture-slot
+  plumbing now lives in
+  `src/legacy_node_stroke_preview_runtime_services.*` instead of staying
+  inline in `src/node_stroke_preview.cpp`.
+- The remaining generic `Node` geometry/state pocket for `SetSize(...)`,
+  `SetMinSize(...)`, `SetMaxSize(...)`, and `SetPosition(const glm::vec2)` now
+  lives in `src/legacy_ui_node_style.*` instead of staying inline in
+  `src/node.cpp`.
+
 Current architecture mismatches that must be treated as real blockers:
 
 - `pp_platform_api` still compiles Apple implementation files instead of only
@@ -262,6 +277,9 @@ Current architecture mismatches that must be treated as real blockers:
   pass planning, shader setup, and live render request assembly now also
   routes through `src/legacy_node_stroke_preview_runtime_services.*` instead
   of staying inline in `src/node_stroke_preview.cpp`, while
+  the low-level preview GL dispatch and texture-slot binding pocket now also
+  routes through `src/legacy_node_stroke_preview_runtime_services.*` instead
+  of staying inline in `src/node_stroke_preview.cpp`, while
   `NodeStrokePreview` remaining mix-pass planning and execution now also route
   through `src/legacy_node_stroke_preview_draw_services.*`, which trims the
   last dedicated mix-orchestration pocket from `src/node_stroke_preview.cpp`,