fix: 完善聊天解析与导出体验

- 修复引用消息名称和图片布局
- 明确单会话图片测试日志范围
- 支持导出文件附件
- 完善图片批测、会话刷新和安全退出

tests/unit/wcdb-close.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, it, vi } from 'vitest'
+import { Wcdb4Client } from '../../src/main/wcdb4-client'
+
+function setPrivate(target: object, key: string, value: unknown): void {
+  Reflect.set(target, key, value)
+}
+
+describe('Wcdb4Client shutdown', () => {
+  it('waits for tracked Koffi calls before shutting down the native runtime', async () => {
+    const client = Object.create(Wcdb4Client.prototype) as Wcdb4Client
+    const shutdown = vi.fn(() => 0)
+    const inFlight = new Set<Promise<unknown>>()
+    let finishCall: (() => void) | undefined
+    const pending = new Promise<void>((resolve) => {
+      finishCall = resolve
+    })
+    inFlight.add(pending)
+    void pending.then(() => inFlight.delete(pending))
+
+    setPrivate(client, 'nativeCallsInFlight', inFlight)
+    setPrivate(client, 'handle', 1)
+    setPrivate(client, 'wcdbShutdown', shutdown)
+    setPrivate(client, 'monitorStarted', false)
+    setPrivate(client, 'displayNameCache', new Map())
+    setPrivate(client, 'avatarCache', new Map())
+    setPrivate(client, 'sessionStatusCache', new Map())
+    setPrivate(client, 'groupNicknameCache', new Map())
+
+    const closing = client.closeAsync(1_000)
+    expect(shutdown).not.toHaveBeenCalled()
+
+    finishCall?.()
+    await expect(closing).resolves.toBe(true)
+    if (process.platform === 'win32') {
+      expect(shutdown).not.toHaveBeenCalled()
+    } else {
+      expect(shutdown).toHaveBeenCalledOnce()
+    }
+  })
+})