feat(ui): complete drainage workbench style migration

src/features/agent/session-state.test.ts

@@ -94,6 +94,33 @@ describe("agent session state", () => {
     });
   });
 
+  it("preserves an actionable question id when its tool placeholder arrives later", () => {
+    const questions = upsertQuestion(undefined, {
+      session_id: "session-1",
+      request_id: "question-1",
+      tool: { messageID: "message-1", callID: "call-1" },
+      questions: [{ header: "范围", question: "选择范围", options: [] }],
+      created_at: 100
+    });
+    const withPlaceholder = upsertQuestion(questions, {
+      session_id: "session-1",
+      request_id: "call-1",
+      tool: { messageID: "message-1", callID: "call-1" },
+      questions: [{ header: "范围", question: "选择范围", options: [] }],
+      created_at: 120
+    });
+    const rejected = applyQuestionResponse(withPlaceholder, {
+      request_id: "question-1",
+      rejected: true
+    });
+
+    expect(withPlaceholder).toHaveLength(1);
+    expect(rejected?.[0]).toMatchObject({
+      requestId: "question-1",
+      status: "rejected"
+    });
+  });
+
   it("finalizes open assistant state after abort", () => {
     const message: AgentChatMessage = {
       id: "assistant-1",