fix: truncate article titles to safe UTF-8 budget

test/test_queue.py

@@ -104,9 +104,26 @@ class QueueTests(unittest.TestCase):
     def test_title_does_not_break_emoji(self):
         short = short_title('😀' * 50)
         self.assertTrue(short.endswith('...'))
-        self.assertLessEqual(len(short.encode('utf-16-le')) // 2, 80)
+        self.assertLessEqual(len(short.encode('utf-8')), 78)
         self.assertEqual(short_title('短标题'), '短标题')
 
+    def test_existing_queued_title_updates_before_import_only(self):
+        original = '中' * 30
+        self.md.write_text('# ' + original + '\n\n正文。\n\n来源：测试，如有侵权，请联系删除。')
+        self.store.enqueue(self.article)
+        with self.store.db() as db:
+            job = self.store.state()['jobs'][0]
+            job['title'] = original  # Simulate a queue created by the old version.
+            self.store._save(db, job)
+        self.store.control('start')
+        job = self.store.next(self.owner)['job']
+        self.assertEqual(job['title'], '中' * 25 + '...')
+        self.assertEqual(self.store.package(dict(owner='tab-a', id=job['id']))['title'], job['title'])
+        self.submit(job)
+        restarted = Store(self.root / 'queue.sqlite3')
+        self.assertEqual(restarted.state()['jobs'][0]['snapshot']['title'], job['title'])
+        self.assertEqual(restarted.state()['jobs'][0]['original_title'], original)
+
     def test_unsupported_images_stop_before_queue(self):
         (self.article / 'a.webp').write_bytes(b'webp')
         with self.assertRaisesRegex(ValueError, '暂不支持'):