feat(agent): in-drawer history tab and denser session layout (AGUI-2)

- Drawer tabs 当前/历史: searchable run list (status/source/time filters,
  cursor auto-load), opens runs inside the drawer, keeps scroll and filters,
  remembers the last tab; 在页面打开 is secondary
- Ended runs: append to resume, or 用同目标新建 with 先看方案再执行 toggle
- Session page: 88ch conversation column, turns grouped with one timestamp,
  tool cards collapse to one line, 3+ activities fold; steps/subagents/budget
  moved to a right rail (collapsible overview bar on narrow screens and in
  the drawer), long model reports fold behind 展开全文
- Smoke covers the drawer history flow

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/agent/agent-helpers.test.ts

@@ -1,6 +1,16 @@
 import type { AgentRunEvent } from "@umt/contracts";
 import { describe, expect, it } from "vitest";
-import { authDenial, isDenied, pairAudit, runPlanIds } from "./agent-conversation.tsx";
+import {
+  authDenial,
+  type ConvEntry,
+  groupConversation,
+  isDenied,
+  isLongReport,
+  pairAudit,
+  runPlanIds,
+  toolSummary,
+} from "./agent-conversation.tsx";
+import { matchesHistory, rangeStart } from "./agent-session-list.tsx";
 import { contextFromPath, contextPrefix, splitContextGoal } from "./agent-store.ts";
 import { foldEvents, type StreamItem, type ToolCallView } from "./use-agent-stream.ts";
 
@@ -111,3 +121,67 @@ describe("事件折叠", () => {
     expect(tools[0]?.kind === "tool" && tools[0].call).toMatchObject({ status: "succeeded", recovery: true });
   });
 });
+
+describe("会话排版(AGUI-2)", () => {
+  const e = (key: string, role: ConvEntry["role"], foldable = false): ConvEntry => ({
+    key,
+    at: key,
+    role,
+    foldable,
+    label: foldable ? "查本地库存" : undefined,
+    node: null,
+  });
+  it("同一助手回合归为一组,用户 / 系统条目打断回合", () => {
+    const blocks = groupConversation([e("a", "assistant"), e("b", "assistant"), e("c", "user"), e("d", "assistant")]);
+    expect(blocks.map((b) => b.kind)).toEqual(["turn", "single", "turn"]);
+    const first = blocks[0];
+    expect(first?.kind === "turn" && first.parts.length).toBe(2);
+  });
+  it("连续 ≥3 条可折叠的活动并成一行,不足 3 条原样展示", () => {
+    const [t] = groupConversation([
+      e("1", "assistant", true),
+      e("2", "assistant", true),
+      e("3", "assistant", true),
+      e("4", "assistant"),
+      e("5", "assistant", true),
+      e("6", "assistant", true),
+    ]);
+    expect(t?.kind).toBe("turn");
+    if (t?.kind !== "turn") return;
+    expect(t.parts.map((p) => (p.kind === "fold" ? `fold${p.entries.length}` : p.entry.key))).toEqual([
+      "fold3",
+      "4",
+      "5",
+      "6",
+    ]);
+  });
+  it("工具卡一行摘要", () => {
+    expect(toolSummary({ status: "running", outputSummary: null })).toBe("等待结果…");
+    expect(toolSummary({ status: "succeeded", outputSummary: '{"items":[1,2,3]}' })).toBe("3 条结果");
+    expect(toolSummary({ status: "failed", outputSummary: '{"error":{"code":"x","message":"超时"}}' })).toBe("超时");
+    expect(toolSummary({ status: "succeeded", outputSummary: '{"found":true,"count":2}' })).toBe(
+      "found: true · count: 2",
+    );
+    expect(toolSummary({ status: "succeeded", outputSummary: "下载器连接超时" })).toBe("下载器连接超时");
+  });
+  it("长汇报判定", () => {
+    expect(isLongReport("短")).toBe(false);
+    expect(isLongReport("x".repeat(601))).toBe(true);
+    expect(isLongReport(Array(14).fill("行").join("\n"))).toBe(true);
+  });
+});
+
+describe("会话历史筛选", () => {
+  const now = new Date("2026-09-29T12:00:00Z").getTime();
+  const run = { id: "abcd1234-0000", goal: "[上下文 作品 x] 把 沙丘 收进来", createdAt: "2026-09-25T12:00:00Z" };
+  it("搜索匹配目标或 ID 前缀", () => {
+    expect(matchesHistory(run, { q: "沙丘", range: "" }, now)).toBe(true);
+    expect(matchesHistory(run, { q: "abcd", range: "" }, now)).toBe(true);
+    expect(matchesHistory(run, { q: "奥本海默", range: "" }, now)).toBe(false);
+  });
+  it("时间范围按创建时间", () => {
+    expect(matchesHistory(run, { q: "", range: "7d" }, now)).toBe(true);
+    expect(matchesHistory(run, { q: "", range: "today" }, now)).toBe(false);
+    expect(rangeStart("", now)).toBeNull();
+  });
+});