feat(xml): add XML tools for validation, beautification, and viewing

src/pages/tools/xml/xml-validator/xml-validator.service.test.ts

@@ -0,0 +1,16 @@
+import { expect, describe, it } from 'vitest';
+import { validateXml } from './service';
+
+describe('xml-validator', () => {
+  it('returns Valid XML for well-formed XML', () => {
+    const input = '<root><a>1</a><b>2</b></root>';
+    const result = validateXml(input, {});
+    expect(result).toBe('Valid XML');
+  });
+
+  it('returns error for invalid XML', () => {
+    const input = '<root><a>1</b></root>';
+    const result = validateXml(input, {});
+    expect(result).toMatch(/Invalid XML/i);
+  });
+});