test(workbench): 增加 DOCX/XLSX 导出与会话隔离单元测试

- 验证 DOCX 二进制 Buffer 生成、TextRun 解析与 Blob 输出
- 验证 XLSX 多表提取、自适应列宽与工作簿 Sheet 命名规范
- 验证 sess-001 与 sess-002 对话隔离及动态追加互不串线

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/data/storage.test.ts

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+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { DEFAULT_MESSAGES, DEFAULT_SESSIONS } from './storage';
+import { ChatMessage } from '../types/workbench';
+
+test('多项目会话消息隔离测试 (Multi-project Session Messages Strict Isolation)', () => {
+  // 1. 验证预设会话消息按 sessionId 严格分离
+  const sess1Msgs = DEFAULT_MESSAGES.filter((m) => m.sessionId === 'sess-001');
+  const sess2Msgs = DEFAULT_MESSAGES.filter((m) => m.sessionId === 'sess-002');
+
+  assert.ok(sess1Msgs.length >= 2, 'sess-001 应当包含其专属消息');
+  assert.ok(sess2Msgs.length >= 2, 'sess-002 应当包含其专属消息');
+
+  // 验证 sess-001 包含内窥镜关键字，不包含超声探头
+  const sess1Combined = sess1Msgs.map((m) => m.content).join(' ');
+  assert.ok(sess1Combined.includes('荧光内窥镜'));
+  assert.ok(!sess1Combined.includes('超声声输出安全标准'));
+
+  // 验证 sess-002 包含超声探头关键字，不包含腹腔镜初稿
+  const sess2Combined = sess2Msgs.map((m) => m.content).join(' ');
+  assert.ok(sess2Combined.includes('便携式掌上无线超声诊断仪'));
+  assert.ok(!sess2Combined.includes('4K超高清荧光内窥镜系统立项与可行性报告'));
+
+  // 2. 模拟向 sess-001 追加一条新消息
+  const allMessages: ChatMessage[] = [...DEFAULT_MESSAGES];
+  const newMsgSess1: ChatMessage = {
+    id: 'm-new-1',
+    sessionId: 'sess-001',
+    role: 'user',
+    content: '请测算一下双棱镜分光成本',
+    timestamp: '14:30',
+  };
+  allMessages.push(newMsgSess1);
+
+  // 3. 验证此时切到 sess-002 时，绝不出现新消息
+  const filteredSess2 = allMessages.filter((m) => m.sessionId === 'sess-002');
+  assert.equal(filteredSess2.length, sess2Msgs.length, 'sess-002 的消息条数应当完全不受 sess-001 变动的影响');
+  assert.ok(!filteredSess2.some((m) => m.content.includes('双棱镜分光成本')));
+
+  // 4. 验证此时切到 sess-001 时，准确多了一条消息
+  const filteredSess1 = allMessages.filter((m) => m.sessionId === 'sess-001');
+  assert.equal(filteredSess1.length, sess1Msgs.length + 1);
+  assert.ok(filteredSess1.some((m) => m.content.includes('双棱镜分光成本')));
+});
+
+test('新建项目会话独立初始化隔离测试 (New Session Spawning & Isolation)', () => {
+  const allSessions = [...DEFAULT_SESSIONS];
+  const newSessId = 'sess-new-999';
+
+  const newSess = {
+    sessionId: newSessId,
+    projectId: 999,
+    title: '神经外科双极电凝系统',
+    deviceType: '高频手术设备',
+    stage: 'V0.1' as const,
+    stageLabel: 'V0.1 需求摸底',
+    messageCount: 1,
+    updatedAt: '刚刚',
+  };
+  allSessions.unshift(newSess);
+
+  const initialMsgs: ChatMessage[] = [
+    ...DEFAULT_MESSAGES,
+    {
+      id: 'm-init-999',
+      sessionId: newSessId,
+      role: 'system',
+      content: '水木东方协同参谋小队已就位，当前项目【神经外科双极电凝系统】进入需求摸底阶段。',
+      timestamp: '刚刚',
+    },
+  ];
+
+  // 检查新项目消息隔离
+  const sess999Msgs = initialMsgs.filter((m) => m.sessionId === newSessId);
+  assert.equal(sess999Msgs.length, 1);
+  assert.ok(sess999Msgs[0].content.includes('神经外科双极电凝系统'));
+
+  // 检查原项目消息数量未变
+  assert.equal(initialMsgs.filter((m) => m.sessionId === 'sess-001').length, 2);
+  assert.equal(initialMsgs.filter((m) => m.sessionId === 'sess-002').length, 2);
+});