Extract canvas toolbar state planning

docs/modernization/roadmap.md

@@ -502,7 +502,9 @@ callbacks before legacy `Brush` mutation and resource loading continue.
 `pano_cli plan-canvas-tool` exposes app-core planning for draw/erase/line,
 camera, grid, copy, cut, fill, mask, flood-fill, pick, and touch-lock toolbar
 commands before legacy `Canvas` mode, pen picking, touch-lock, and transform
-state mutation continue.
+state mutation continue. `pano_cli plan-canvas-tool-state` exposes the matching
+toolbar active-state refresh used by `App::update` before legacy `Canvas` mode
+state remains the source of truth.
 `pano_cli plan-grid-operation` exposes app-core planning for grid heightmap
 pick/load/reload/clear, lightmap render capability/limit checks, and heightmap
 commit used by the live grid panel before legacy image loading, OpenGL texture
@@ -1164,13 +1166,18 @@ Results:
   grid/heightmap/lightmap planning as JSON automation.
 - `pp_app_core_canvas_tool_ui_tests` passed, covering toolbar mode selection,
   copy/cut transform action planning, pick no-op outside draw mode, and
-  touch-lock toggling.
+  touch-lock toggling, plus toolbar active-state derivation for draw, copy, and
+  bucket modes.
 - `pano_cli_plan_canvas_tool_draw_smoke`,
   `pano_cli_plan_canvas_tool_copy_smoke`,
   `pano_cli_plan_canvas_tool_pick_noop_smoke`,
   `pano_cli_plan_canvas_tool_touch_lock_smoke`, and
   `pano_cli_plan_canvas_tool_rejects_unknown` passed and expose live draw
   toolbar planning as JSON automation.
+- `pano_cli_plan_canvas_tool_state_draw_smoke`,
+  `pano_cli_plan_canvas_tool_state_copy_smoke`, and
+  `pano_cli_plan_canvas_tool_state_rejects_unknown` passed and expose draw
+  toolbar active-state refresh as JSON automation.
 - `pp_app_core_history_ui_tests` passed, covering undo/redo availability,
   no-op history commands, clear-history stack/memory state, memory-only clear,
   and negative metric rejection.