fix: html trans 500

src/core/engine.ts

@@ -129,7 +129,7 @@ export class TranslationEngine {
 
     let translation: string;
     try {
-      if (cleanText.length > this.maxSentenceLength) {
+      if (cleanText.length > this.maxSentenceLength && !effectiveOptions.html) {
         translation = this._translateLongText(cleanText, effectiveOptions);
       } else {
         translation = this._translateInternal(cleanText, effectiveOptions);

tests/engine-html.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, test } from 'bun:test';
+import { TranslationEngine } from '@/core/engine';
+
+describe('TranslationEngine HTML handling', () => {
+  test('long html skips plain text splitting', () => {
+    const engine = new TranslationEngine() as any;
+    engine.isReady = true;
+
+    let usedLongText = false;
+    let usedInternal = false;
+
+    engine._translateLongText = () => {
+      usedLongText = true;
+      return 'split';
+    };
+
+    engine._translateInternal = (text: string, options: { html?: boolean }) => {
+      usedInternal = true;
+      expect(options.html).toBe(true);
+      return text;
+    };
+
+    const html = `<p dir="auto">${'Hello world '.repeat(80)}<a href="https://example.com">example</a></p>`;
+    const result = engine.translate(html, { html: true });
+
+    expect(result).toBe(html);
+    expect(usedInternal).toBe(true);
+    expect(usedLongText).toBe(false);
+  });
+});