refactor(gui): route the composer chain on PendingWait currency

packages/client/ui-trajectory/tests/views.spec.tsx

@@ -28,9 +28,12 @@ import { WaterfallView } from '@deepseek-ai/dsh-client-ui-trajectory/src/client/
 import { apply as nodeApply } from '@deepseek-ai/dsh-client-ui-trajectory'
 
 const SID = 's1' as SessionId
-/** Fallback-only renderSlot stub (no composer takeover in these benches). */
-const fallbackRenderSlot: ConversationSlotProps['renderSlot'] =
+/** Fallback-only chain stub (no composer takeover in these benches). */
+const fallbackRenderSlotChain: ConversationSlotProps['renderSlotChain'] =
   (_key, _owner, opts) => opts?.fallback ?? null
+/** Non-chain renderSlot stub: ConversationRoot renders no non-chain child keys. */
+const unusedRenderSlot: ConversationSlotProps['renderSlot'] =
+  (() => { throw new Error('no non-chain child keys') }) as unknown as ConversationSlotProps['renderSlot']
 /** Standard-seat stub: ConversationRoot never renders it, delivery is mandatory in the props type. */
 const StubSessionProvider: ConversationSlotProps['SessionProvider'] = ({ children }) => <>{children(SID)}</>
 
@@ -112,7 +115,8 @@ function mount(svc: ConversationService, nodes: ConversationSnapshot['nodes'] =
       openDetails={vi.fn()}
       loadOlder={vi.fn()}
       open={vi.fn()}
-      renderSlot={fallbackRenderSlot}
+      renderSlot={unusedRenderSlot}
+      renderSlotChain={fallbackRenderSlotChain}
       SessionProvider={StubSessionProvider}
     />,
   )