Extract main toolbar action planning

docs/modernization/roadmap.md

@@ -534,6 +534,11 @@ updates, nanort lightmap baking, and `Canvas::draw_objects` execution continue.
 `pano_cli plan-history-operation` exposes app-core planning for undo, redo, and
 clear-history availability used by toolbar buttons and canvas shortcuts before
 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.
 `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,
@@ -1286,6 +1291,14 @@ Results:
   `pano_cli_plan_about_menu_crash_disabled_smoke`, and
   `pano_cli_plan_about_menu_rejects_unknown` passed and expose live About menu
   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.
+- `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
+  `pano_cli_plan_main_toolbar_rejects_negative_count` passed and expose live
+  toolbar/status planning as JSON automation.
 - `pp_app_core_document_sharing_tests` passed, covering saved-path gating before
   platform share execution.
 - `pano_cli_plan_share_file_unsaved_smoke` and