refactor(runtime): close canonical gameplay ownership

Unify the toolbar shortcut manager with Runtime inventory state, route retail-ordered shortcut and spellbook command effects through the canonical owners, and make retained controllers borrow those exact instances. Remove the item-interaction transaction fallback and add graphical/no-window parity plus failure-safe terminal ownership-ledger coverage.

Co-authored-by: Codex <codex@openai.com>

tests/AcDream.App.Tests/UI/RetailUiInteractionFlowTests.cs

@@ -163,6 +163,7 @@ public sealed class RetailUiInteractionFlowTests
         {
             var interaction = new ItemInteractionController(
                 Objects,
+                new InventoryTransactionState(Objects),
                 playerGuid: () => Player,
                 sendUse: Uses.Add,
                 sendUseWithTarget: (source, target) => UseWithTarget.Add((source, target)),
@@ -197,6 +198,7 @@ public sealed class RetailUiInteractionFlowTests
         {
             itemInteraction ??= new ItemInteractionController(
                 Objects,
+                new InventoryTransactionState(Objects),
                 () => Player,
                 sendUse: null,
                 sendUseWithTarget: null,