Extract quick UI operation planning

docs/modernization/roadmap.md

@@ -503,6 +503,10 @@ callbacks before legacy `Brush` mutation and resource loading continue.
 pick/load/reload/clear, lightmap render capability/limit checks, and heightmap
 commit used by the live grid panel before legacy image loading, OpenGL texture
 updates, nanort lightmap baking, and `Canvas::draw_objects` 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,
+stroke preview, and preset popup execution continue.
 `pp_platform_api` now owns a headless `PlatformServices` interface for
 startup storage path preparation, clipboard text, cursor visibility,
 virtual-keyboard visibility, UI-thread lifecycle hooks, render-context
@@ -1151,6 +1155,16 @@ Results:
   `pano_cli_plan_grid_operation_rejects_empty_reload`, and
   `pano_cli_plan_grid_operation_rejects_bad_samples` passed and expose live
   grid/heightmap/lightmap planning as JSON automation.
+- `pp_app_core_quick_ui_tests` passed, covering quick brush/color slot
+  selection, active-slot popup decisions, invalid slot rejection, restore-state
+  validation, and reset-state validation.
+- `pano_cli_plan_quick_operation_select_brush_smoke`,
+  `pano_cli_plan_quick_operation_open_color_smoke`,
+  `pano_cli_plan_quick_operation_restore_smoke`,
+  `pano_cli_plan_quick_operation_reset_smoke`,
+  `pano_cli_plan_quick_operation_rejects_bad_slot`, and
+  `pano_cli_plan_quick_operation_rejects_bad_restore` passed and expose live
+  quick-panel 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