fix: truncate article titles to safe UTF-8 budget

test/importer.test.cjs

@@ -29,12 +29,11 @@ test('测试文章：标题、3 张配图、插入顺序、来源与段落完整
     assert.equal(output, originalBody);
 });
 
-test('缺图、远程图片、超出目录、超大图片与超长标题在上传前被拒绝', () => {
+test('缺图、远程图片、超出目录与超大图片在上传前被拒绝', () => {
     assert.throws(() => core.compile('# 标题\n\n![](missing.jpg)', 'a.md', new Map()), /找不到配图/);
     assert.throws(() => core.compile('# 标题\n\n![](https://x/a.jpg)', 'a.md', new Map()), /目录内/);
     assert.throws(() => core.imagePath('a.md', '../secret.jpg'), /超出/);
     assert.throws(() => core.imagePath('a.md', '%2fetc/passwd'), /相对路径/);
-    assert.throws(() => core.compile('# ' + '长'.repeat(81) + '\n正文', 'a.md', new Map()), /80/);
     assert.throws(() => core.compile('# 标题\n\n![](big.png)', 'a.md', new Map([['big.png', {size:20*1024*1024}]])), /20 MB/);
 });
 
@@ -209,3 +208,39 @@ test('正文图片尚在加载时等待 load；终止后释放等待', async ()
  const cancelled=core.verifyEditorImages({querySelectorAll:()=>[pending]},['8'],controller.signal);
  controller.abort();await assert.rejects(cancelled,/终止/);assert.equal(pending.events.size,0);
 });
+
+
+test('标题按 UTF-8 预算截断，目录和文章包保持一致且重复处理稳定', async () => {
+    const cases = [
+        ['A'.repeat(75), 'A'.repeat(75)],
+        ['A'.repeat(76), 'A'.repeat(75) + '...'],
+        ['中'.repeat(25), '中'.repeat(25)],
+        ['中'.repeat(26), '中'.repeat(25) + '...'],
+        ['A中，'.repeat(12), 'A中，'.repeat(10) + 'A中...'],
+        ['😀'.repeat(20), '😀'.repeat(18) + '...'],
+    ];
+    for (const [title, expected] of cases) {
+        assert.equal(core.shortTitle(title), expected);
+        assert.equal(core.shortTitle(expected), expected);
+        assert.ok(Buffer.byteLength(expected) <= 78);
+        const markdown = '# ' + title + '\n正文';
+        const direct = core.compile(markdown, 'a.md', new Map());
+        const packaged = await core.preparePackage({schemaVersion:1, markdown, title, images:[]});
+        assert.equal(direct.title, expected);
+        assert.equal(packaged.title, expected);
+        const python = execFileSync('python3', ['-c', 'import sys; from articles import short_title; print(short_title(sys.argv[1]), end="")', title], {cwd:path.join(__dirname, '..'), encoding:'utf8'});
+        assert.equal(python, expected);
+    }
+});
+
+test('长标题预览、实际填写和返回结果一致', async () => {
+    const h = harness();
+    const title = '新闻，'.repeat(20);
+    await h.api.stagePackage({schemaVersion:1, markdown:'# ' + title + '\n正文', images:[]});
+    const expected = '新闻，'.repeat(8) + '新...';
+    assert.equal(h.api.getState().title, expected);
+    const result = await h.api.importPrepared();
+    assert.equal(h.ids.get('subject').value, expected);
+    assert.equal(result.title, expected);
+    assert.equal(h.requests.length, 0);
+});