Extract edit menu and Windows/bootstrap preview seams

docs/modernization/tasks.md

@@ -148,6 +148,11 @@ Current slice:
   target setup was removed from `render_to_image()` and the queued worker path,
   but the preview node still owns broader live-pass state and thread-facing
   orchestration.
+- `NodeStrokePreview` main live-pass request assembly and preview framebuffer-
+  copy setup now also route through
+  `legacy_node_stroke_preview_execution_services.h`, which trims another
+  coherent pass-setup block from `src/node_stroke_preview.cpp`, but broader
+  preview-pass orchestration is still inline.
 - `NodeCanvas` merged-path per-plane merged-texture draw execution now also
   routes through `execute_legacy_canvas_draw_merge_layer_texture(...)`.
 - `NodeCanvas` merged-path and non-blend checkerboard background setup now also
@@ -293,7 +298,7 @@ targets look like helpers under one old monolith.
 Status: In Progress
 
 Why now:
-`src/app_layout.cpp` is still a 743-line mixed file that builds menus,
+`src/app_layout.cpp` is still a 717-line mixed file that builds menus,
 attaches callbacks, computes planner inputs, and mutates UI state directly.
 
 Current slice:
@@ -316,6 +321,10 @@ Current slice:
 - Main-toolbar binding now also lives in `src/app_layout_main_toolbar.cpp`,
   and `App::init_toolbar_main()` is now a thin call-through, but edit-menu
   wiring and broader layout composition are still inline in `src/app_layout.cpp`.
+- Edit-menu binding now also lives in `src/app_layout_edit_menu.cpp`, and
+  `App::init_menu_edit()` is now a thin call-through, but draw-toolbar,
+  brush-refresh, and broader layout composition are still inline in
+  `src/app_layout.cpp`.
 
 Write scope:
 - `src/app_layout.cpp`
@@ -476,12 +485,12 @@ Current slice:
   wakeup posting, stylus frame update, window preference save, and VR
   lifecycle wrappers now also live in
   `src/platform_windows/windows_lifecycle_shell.cpp` instead of `src/main.cpp`
-- `main.cpp` startup/window/bootstrap flow now also routes through named local
-  helpers for runtime-data discovery, startup-state initialization, window
-  creation, pixel-format setup, GL loader init, runtime-info logging, and
-  core-context upgrade sequencing, but the retained Win32 shell still needs
-  those helpers moved into platform-owned modules before the file materially
-  shrinks
+- Win32 startup/window/bootstrap flow now also lives in
+  `src/platform_windows/windows_bootstrap_helpers.*` for runtime-data
+  discovery, startup-state initialization, window creation, pixel-format
+  setup, GL loader init, runtime-info logging, and core-context upgrade
+  sequencing, which materially thins `src/main.cpp`, but the retained Win32
+  window procedure and broader shell flow are still open
 - prepared-file background work now runs through an `AppRuntime`-owned worker
   queue instead of a retained static worker in `src/app_events.cpp`
 - canvas async import/export/save/open background work now also runs through an