Extract main toolbar and thin startup/node helpers

docs/modernization/roadmap.md

@@ -80,10 +80,10 @@ What is still carrying too much live ownership:
 Current hotspot files:
 
 - `src/canvas.cpp`: 2645 lines
-- `src/app_layout.cpp`: 785 lines
+- `src/app_layout.cpp`: 743 lines
 - `src/canvas_modes.cpp`: 1798 lines
-- `src/node.cpp`: 1551 lines
-- `src/main.cpp`: 882 lines
+- `src/node.cpp`: 1594 lines
+- `src/main.cpp`: 1098 lines
 - `src/node_panel_brush.cpp`: 1197 lines
 - `src/node_stroke_preview.cpp`: 933 lines
 - `src/node_canvas.cpp`: 910 lines
@@ -140,10 +140,13 @@ Current architecture mismatches that must be treated as real blockers:
   `src/app_layout_about_layer_menu.cpp` and `App::init_menu_about()` plus
   `App::init_menu_layer()` are now thin call-throughs, while sidebar panel
   binding and popup wiring now also live in `src/app_layout_sidebar.cpp` and
-  `App::init_sidebar()` is now a thin call-through, while the informational
-  overlay opener family now also lives in `src/app_dialogs_info_openers.cpp`
-  and the corresponding `App::dialog_*` entrypoints are thinner, while the
-  export/video/PPBR dialog family now also lives in
+  `App::init_sidebar()` is now a thin call-through, while main-toolbar binding
+  now also lives in `src/app_layout_main_toolbar.cpp` and
+  `App::init_toolbar_main()` is now a thin call-through, while the
+  informational overlay opener family now also lives in
+  `src/app_dialogs_info_openers.cpp` and the corresponding `App::dialog_*`
+  entrypoints are thinner, while the export/video/PPBR dialog family now also
+  lives in
   `src/app_dialogs_export.cpp` and those `App::dialog_*` entrypoints are
   thinner too, while new/open/save/browse/resize workflow entrypoints now also
   live in `src/app_dialogs_workflow.cpp` and `src/app_dialogs.cpp` is now
@@ -183,6 +186,12 @@ Current architecture mismatches that must be treated as real blockers:
   sequencing, FPS title update/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`,
+  while the Win32 startup/window/bootstrap path in `src/main.cpp` now also
+  routes through named local helper functions for runtime-data discovery,
+  startup-state initialization, window creation, pixel-format setup, GL loader
+  init, runtime-info logging, and core-context upgrade sequencing even though
+  that state still needs to move into platform-owned modules for the file to
+  shrink materially,
   while `App::rec_loop()` now delegates worker-iteration orchestration into
   the retained recording bridge, `App::update_rec_frames()` now delegates
   recording label refresh through that same retained recording path, and the
@@ -198,7 +207,11 @@ Current architecture mismatches that must be treated as real blockers:
   document-IO cluster now lives in `src/legacy_canvas_document_io_services.cpp`
   and `NodeStrokePreview` render-target setup plus immediate-pass sequencing
   now route through retained preview execution helpers, even though the bridge
-  still owns worker-side readback flow and encoder-state label reads.
+  still owns worker-side readback flow and encoder-state label reads, while
+  `Node` child attach/detach/reorder operations now route through named local
+  helpers in `src/node.cpp`, which makes the scene-graph mutation paths easier
+  to reason about without yet reducing the file or moving ownership into
+  `pp_ui_core`.
 - Modern C++23 usage exists in extracted components, especially `std::span`,
   explicit result/status objects, and a few concepts, but the live app still
   does not consistently express ownership, thread affinity, or renderer

docs/modernization/tasks.md

@@ -293,7 +293,7 @@ targets look like helpers under one old monolith.
 Status: In Progress
 
 Why now:
-`src/app_layout.cpp` is still a 1249-line mixed file that builds menus,
+`src/app_layout.cpp` is still a 743-line mixed file that builds menus,
 attaches callbacks, computes planner inputs, and mutates UI state directly.
 
 Current slice:
@@ -313,6 +313,9 @@ Current slice:
   `src/app_layout_sidebar.cpp`, and `App::init_sidebar()` is now a thin
   call-through, but edit-menu wiring and broader layout composition are still
   inline in `src/app_layout.cpp`.
+- 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`.
 
 Write scope:
 - `src/app_layout.cpp`
@@ -473,6 +476,12 @@ 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
 - 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
@@ -632,6 +641,12 @@ Why now:
 mixes raw `Node*`, shared ownership, direct `add_child(...)`, and callback
 captures across mutation points.
 
+Current slice:
+- `src/node.cpp` child attach/detach/reorder paths now route through named
+  local helpers instead of repeating raw mutation logic inline. That improves
+  scene-graph mutation clarity, but it does not yet change the ownership model
+  or move those paths behind checked handles.
+
 Write scope:
 - `src/node.*`
 - `src/layout.*`