feat: 完成Tab①采集旧数据

新增 CollectWorker，通过后台线程逐条采集旧标题和旧封面，成功后立即 db.set_collected 写库。

采集前按别名匹配账号并检测登录态；未匹配或未登录写 skipped，单条采集失败 mark_failed 后继续。

Tab① 增加采集/停止按钮和进度状态回传；补充 GUI 测试覆盖成功采集、未登录略过和未匹配略过；同步任务文档与 progress。

tests/test_gui.py

@@ -19,6 +19,7 @@ from PySide6.QtWidgets import QApplication, QLineEdit, QTableView
 from app.gui import (
     AccountDialog,
     AccountsTab,
+    CollectWorker,
     CollectTab,
     MainWindow,
     TAB_STYLE,
@@ -35,6 +36,7 @@ class GuiTests(TempDirMixin, unittest.TestCase):
         return {
             "chrome_path": "chrome.exe",
             "user_data_root": os.path.join(temp_dir, "chrome_user_data_dir"),
+            "image_dir": os.path.join(temp_dir, "images"),
             "db_path": os.path.join(temp_dir, "cmshopee.db"),
             "debug_port_range": [9222, 9260],
         }
@@ -303,6 +305,83 @@ class GuiTests(TempDirMixin, unittest.TestCase):
 
         self.assert_removed(temp_dir)
 
+    def test_collect_worker_collects_success_and_skips_unmatched_or_logged_out(self):
+        with self.make_temp_dir() as temp_dir:
+            cfg = self.make_config(temp_dir)
+            logged = accounts.create_account("主店", "alias-a", debug_port=9222, config=cfg)
+            logged_out = accounts.create_account("副店", "alias-b", debug_port=9223, config=cfg)
+            batch_id = db.create_batch(["input.xlsx"], path=cfg["db_path"])
+            db.insert_tasks(
+                batch_id,
+                [
+                    {
+                        "source_file_abs": os.path.join(temp_dir, "input.xlsx"),
+                        "source_sheet": "商品",
+                        "source_row": 2,
+                        "account_name": "Excel主店",
+                        "alias": "alias-a",
+                        "item_id": "51100639510",
+                    },
+                    {
+                        "source_file_abs": os.path.join(temp_dir, "input.xlsx"),
+                        "source_sheet": "商品",
+                        "source_row": 3,
+                        "account_name": "Excel副店",
+                        "alias": "alias-b",
+                        "item_id": "51100639511",
+                    },
+                    {
+                        "source_file_abs": os.path.join(temp_dir, "input.xlsx"),
+                        "source_sheet": "商品",
+                        "source_row": 4,
+                        "account_name": "Excel未知",
+                        "alias": "missing",
+                        "item_id": "51100639512",
+                    },
+                ],
+                path=cfg["db_path"],
+            )
+            tasks = db.list_tasks(batch_id=batch_id, path=cfg["db_path"])
+
+            def fake_login(account, path=None, config=None):
+                self.assertEqual(cfg["db_path"], path)
+                if account.alias == logged.alias:
+                    return {"logged_in": True, "reason": None}
+                if account.alias == logged_out.alias:
+                    return {"logged_in": False, "reason": "LOGIN_PAGE"}
+                raise AssertionError(account.alias)
+
+            def fake_collect(account, task):
+                self.assertEqual(logged.alias, account.alias)
+                self.assertEqual("51100639510", task["item_id"])
+                self.assertTrue(task["old_cover_path"].endswith(
+                    os.path.join(logged.slug, "51100639510_old.jpg")
+                ))
+                return {
+                    "old_title": "旧标题",
+                    "old_cover_path": task["old_cover_path"],
+                }
+
+            with mock.patch("app.gui.accounts.detect_login", side_effect=fake_login), \
+                    mock.patch("app.gui.editor.collect", side_effect=fake_collect) as collect:
+                summary = CollectWorker(tasks, db_path=cfg["db_path"], config=cfg).execute()
+
+            self.assertEqual({"ok": True, "total": 3, "done": 3, "collected": 1, "skipped": 2, "failed": 0}, summary)
+            collect.assert_called_once()
+            updated = db.list_tasks(batch_id=batch_id, path=cfg["db_path"])
+            by_alias = {task.alias: task for task in updated}
+            self.assertEqual("collected", by_alias["alias-a"].stage)
+            self.assertEqual("success", by_alias["alias-a"].status)
+            self.assertEqual("旧标题", by_alias["alias-a"].old_title)
+            self.assertTrue(by_alias["alias-a"].old_cover_path.endswith("51100639510_old.jpg"))
+            self.assertEqual("imported", by_alias["alias-b"].stage)
+            self.assertEqual("skipped", by_alias["alias-b"].status)
+            self.assertIn("账号未登录", by_alias["alias-b"].last_error)
+            self.assertEqual("skipped", by_alias["missing"].status)
+            self.assertEqual("别名未匹配账号", by_alias["missing"].last_error)
+
+        self.assert_removed(temp_dir)
+
 
 if __name__ == "__main__":
     unittest.main()