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/mock.ts

@@ -245,7 +245,15 @@ function seed() {
   const now = Date.now();
   add("把 沙丘：第二部 的 4K 收进来", { proposeFirst: false }, now - 3_600_000, 1);
   add("对比一下 奥本海默 现有版本和站点上的 4K", { proposeFirst: true }, now - 7_200_000, 2);
-  const failed = add("检查 qb-main 为什么占满磁盘", { proposeFirst: false }, now - 86_400_000, 3);
+  const failed = add("巡检：检查 qb-main 为什么占满磁盘", { proposeFirst: false }, now - 86_400_000, 3);
+  failed.run = { ...failed.run, trigger: "schedule" };
+  const evt = add(
+    "新资源到达：看看 奥本海默 的 REMUX 是否值得替换现有版本",
+    { proposeFirst: false },
+    now - 3 * 86_400_000,
+    4,
+  );
+  evt.run = { ...evt.run, trigger: "event" };
   failed.steps = [
     { delayMs: 0, body: { type: "run_started", goal: failed.run.goal, resumed: false } },
     {