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-interaction.tsx

@@ -32,15 +32,18 @@ export function planTodoItems(steps: AgentPlanStep[]): TodoItem[] {
   }));
 }
 
-/** 步骤清单:会话页顶部完整列表(实时勾选);抽屉里压缩成一行进度 */
+/** 步骤清单:会话页右侧栏完整列表(实时勾选);compact 压缩成一行进度 */
 export function RunPlan({
   plan,
   active,
   compact = false,
+  fill = false,
 }: {
   plan: { steps: AgentPlanStep[]; revision: number } | null;
   active: boolean;
   compact?: boolean;
+  /** 侧栏 / 展开的概况条里:不限高、不自动收起 */
+  fill?: boolean;
 }) {
   if (!plan?.steps.length) return null;
   const done = plan.steps.filter((s) => s.status === "done" || s.status === "skipped").length;
@@ -79,8 +82,8 @@ export function RunPlan({
       title="步骤"
       items={planTodoItems(plan.steps)}
       defaultOpen
-      collapseOnComplete={!active}
-      maxHeightClassName="max-h-56"
+      collapseOnComplete={!fill && !active}
+      maxHeightClassName={fill ? "max-h-none" : "max-h-56"}
     />
   );
 }