feat(agent): render local interactive answers and fold completed process

src/features/agent/answer-ui/answer-presentation.test.ts

@@ -0,0 +1,54 @@
+import { describe, expect, it } from "vitest";
+import type { AgentChatMessage } from "../types";
+import { getAnswerPresentation } from "./answer-presentation";
+import type { AnswerUiPart } from "./contract";
+
+const ui = (id: string): AnswerUiPart => ({
+  type: "answer-ui",
+  block: {
+    version: "answer-ui@1",
+    block_id: id,
+    fallback_text: id,
+    spec: {
+      root: "text",
+      elements: { text: { type: "Text", props: { text: id, tone: "neutral" }, children: [] } }
+    }
+  }
+});
+const parts: AnswerUiPart[] = [
+  { type: "text", text: "正在核对资料。" },
+  ui("report-chart"),
+  ui("temporary"),
+  { type: "text", text: "查询结束。" }
+];
+const message: AgentChatMessage = {
+  id: "a",
+  role: "assistant",
+  content: "正在核对资料。",
+  answerParts: parts
+};
+describe("final report and collapsible process", () => {
+  it("shows all incremental content while waiting for final_answer", () => {
+    expect(getAnswerPresentation(message)).toEqual({ report: parts, process: [], final: false });
+  });
+  it("keeps only the final report and explicitly selected components expanded", () => {
+    const view = getAnswerPresentation({
+      ...message,
+      finalAnswer: {
+        content: "最后的报告内容。",
+        uiBlockIds: ["report-chart", "report-chart", "missing"]
+      }
+    });
+    expect(view.report).toEqual([{ type: "text", text: "最后的报告内容。" }, parts[1]]);
+    expect(view.process).toEqual([parts[0], parts[2], parts[3]]);
+    expect(view.final).toBe(true);
+  });
+  it("folds every UI block when the final report does not reference any", () => {
+    const view = getAnswerPresentation({
+      ...message,
+      finalAnswer: { content: "报告", uiBlockIds: [] }
+    });
+    expect(view.report).toEqual([{ type: "text", text: "报告" }]);
+    expect(view.process).toEqual(parts);
+  });
+});