Add main toolbar service boundary

docs/modernization/roadmap.md

@@ -537,8 +537,10 @@ legacy `ActionManager` stack execution continues.
 `pano_cli plan-main-toolbar` exposes app-core planning for the live main
 toolbar/status-bar shell, including open/save dialogs, undo/redo availability,
 clear-history availability, clear-canvas no-canvas blocking, message-box
-creation, and settings dialog routing before legacy dialogs, `ActionManager`,
-and `Canvas` execution continue.
+creation, and settings dialog routing. `pp_app_core` now also owns a
+`MainToolbarServices` executor boundary, so `App::init_toolbar_main` dispatches
+through a legacy adapter before legacy dialogs, `ActionManager`, and `Canvas`
+execution continue.
 `pano_cli plan-quick-operation` exposes app-core planning for quick brush/color
 slot selection versus popup opening, plus quick mini-state restore/reset
 validation used by the live quick panel before legacy `Brush`, color picker,
@@ -1293,7 +1295,8 @@ Results:
   planning as JSON automation.
 - `pp_app_core_main_toolbar_tests` passed, covering live toolbar/status direct
   dialog routing, undo/redo availability, clear-history availability, no-canvas
-  clear blocking, and negative history metric rejection.
+  clear blocking, negative history metric rejection, and dispatch through the
+  `MainToolbarServices` executor boundary without invoking no-op actions.
 - `pano_cli_plan_main_toolbar_undo_smoke`,
   `pano_cli_plan_main_toolbar_redo_empty_smoke`,
   `pano_cli_plan_main_toolbar_clear_canvas_no_canvas_smoke`, and