fix(web): replayed tool call after resume reuses its card (duplicate React key)

A suspended agent.propose_options / approval call is replayed on resume with the
same toolCallId; foldEvents pushed a second item with the same key, which also
inflated the tool call meter. Also use 「」 in the report footnote.

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

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

@@ -1,7 +1,8 @@
+import type { AgentRunEvent } from "@umt/contracts";
 import { describe, expect, it } from "vitest";
 import { authDenial, isDenied, pairAudit, runPlanIds } from "./agent-conversation.tsx";
 import { contextFromPath, contextPrefix, splitContextGoal } from "./agent-store.ts";
-import type { StreamItem, ToolCallView } from "./use-agent-stream.ts";
+import { foldEvents, type StreamItem, type ToolCallView } from "./use-agent-stream.ts";
 
 const call = (p: Partial<ToolCallView>): ToolCallView => ({
   toolCallId: "t1",
@@ -81,3 +82,32 @@ describe("侧栏上下文", () => {
     expect(splitContextGoal(goal)).toEqual({ context: expect.stringContaining("taskId="), text: "排查这个任务" });
   });
 });
+
+describe("事件折叠", () => {
+  const ev = (seq: number, body: Record<string, unknown>) =>
+    ({ runId: "r1", seq, at: "2026-09-28T00:00:00.000Z", ...body }) as unknown as AgentRunEvent;
+  it("挂起后恢复重放同一 toolCallId:只保留一张工具卡,状态以重放为准", () => {
+    const start = {
+      type: "tool_call_start",
+      toolCallId: "tc1",
+      capabilityId: "agent.propose_options",
+      inputSummary: "{}",
+    };
+    const items = foldEvents([
+      ev(1, { ...start, recovery: false }),
+      ev(2, { ...start, recovery: true }),
+      ev(3, {
+        type: "tool_call_end",
+        toolCallId: "tc1",
+        capabilityId: "agent.propose_options",
+        outputSummary: "ok",
+        isError: false,
+        recovery: true,
+      }),
+    ]);
+    const tools = items.filter((i) => i.kind === "tool");
+    expect(tools).toHaveLength(1);
+    expect(new Set(items.map((i) => i.key)).size).toBe(items.length);
+    expect(tools[0]?.kind === "tool" && tools[0].call).toMatchObject({ status: "succeeded", recovery: true });
+  });
+});