feat: 完成工作流多文件文档解析闭环

- 支持文档解析节点批量解析并收口为 documents 轻量输出

- 收口引用树、节点输出展示与旧工作流固定输出兼容

- 修复共享按钮点击事件，恢复多个节点加号交互

easyflow-ui-admin/packages/tinyflow-ui/src/components/base/Button.test.ts

@@ -0,0 +1,53 @@
+import { flushSync, mount, unmount } from 'svelte';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import Button from './button.svelte';
+import MenuButton from './menu-button.svelte';
+
+describe('Button', () => {
+  afterEach(() => {
+    document.body.innerHTML = '';
+  });
+
+  it('转发 onclick 到原生按钮', async () => {
+    const handleClick = vi.fn();
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+
+    const app = mount(Button, {
+      target: host,
+      props: {
+        onclick: handleClick,
+      },
+    });
+    flushSync();
+
+    (host.querySelector('button') as HTMLButtonElement).click();
+
+    expect(handleClick).toHaveBeenCalledTimes(1);
+
+    await unmount(app);
+    host.remove();
+  });
+
+  it('通过 MenuButton 转发 onclick 到原生按钮', async () => {
+    const handleClick = vi.fn();
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+
+    const app = mount(MenuButton, {
+      target: host,
+      props: {
+        onclick: handleClick,
+      },
+    });
+    flushSync();
+
+    (host.querySelector('button') as HTMLButtonElement).click();
+
+    expect(handleClick).toHaveBeenCalledTimes(1);
+
+    await unmount(app);
+    host.remove();
+  });
+});