diff --git a/app/gui/tabs/collect.py b/app/gui/tabs/collect.py
index d74a80b..5ae1d95 100644
--- a/app/gui/tabs/collect.py
+++ b/app/gui/tabs/collect.py
@@ -194,8 +194,9 @@ class CollectTab(QWidget):
         self._append_collect_log(safe_message)
 
     def _show_error(self, message):
-        QMessageBox.warning(self, "导入采集", str(message))
-        self._set_status(str(message))
+        text = str(message)
+        self._set_status(text, level="danger")
+        QTimer.singleShot(0, lambda: QMessageBox.warning(self, "导入采集", text))
 
     def _show_account_guide(self, message):
         full_message = (
diff --git a/docs/tasks/T-582.md b/docs/tasks/T-582.md
index 8909a71..e0ed020 100644
--- a/docs/tasks/T-582.md
+++ b/docs/tasks/T-582.md
@@ -3,7 +3,7 @@ id: T-582
 title: 修复①导入 Excel 失败通知弹窗偶发只显示一半（延迟一拍弹窗）
 phase: 7
 deps: []
-status: TODO
+status: DONE
 created: 2026-07-10
 ---
 
@@ -55,4 +55,12 @@ created: 2026-07-10
 
 ## 执行记录
 
-（做完在这里写：改了什么文件、跑了什么验证命令及结果、遇到的阻塞、关键决策。）
+- 2026-07-10：已实现 `_show_error()` 延迟弹出导入失败通知：状态栏仍同步显示错误，`QMessageBox.warning(self, "导入采集", text)` 改为经 `QTimer.singleShot(0, ...)` 下一拍执行，降低刷新/绘制同栈内立即弹模态框导致首帧显示不完整的概率。
+- 2026-07-10：未改导入成功路径；成功导入仍只刷新列表、更新 summary、状态栏显示“导入完成...”，不新增成功弹窗。未改 `_show_account_guide()`、删除批次确认框、HiDPI 全局设置、导入解析入库逻辑。
+- 2026-07-10：补 `tests/test_gui.py`：成功导入断言不会调用 `QTimer.singleShot` 和弹窗；导入异常时断言 `QTimer.singleShot(0, callback)` 被调用、回调执行前不直接弹窗、run log/脱敏错误/弹窗标题正文不回归。
+- 当前工作区验证通过：
+  - `py -3.10 -m unittest tests.test_gui.GuiTests.test_collect_tab_import_button_imports_excel_and_refreshes_tasks tests.test_gui.GuiTests.test_collect_tab_import_error_dialog_is_delayed_one_event_loop tests.test_gui.GuiTests.test_collect_tab_import_excel_writes_diagnostic_run_log`
+  - `python -m ruff check app tests main.py`
+  - `py -3.10 -m compileall app main.py`
+  - `git diff --check`（仅输出当前工作区既有 CRLF 提示，无空白错误）
+- 当前工作区直接运行 `py -3.10 -m unittest tests.test_gui` 失败 2 项，原因是本任务开始前已有未提交改动把默认封面提示词从 `papa1` 改成「默认」，导致两个旧断言仍期望 `papa1`；该提示词改名不属于 T-582，本次未处理、未提交。提交后需用干净 worktree 验证本次提交本身。
diff --git a/tests/test_gui.py b/tests/test_gui.py
index d3389f8..c8e9503 100644
--- a/tests/test_gui.py
+++ b/tests/test_gui.py
@@ -5907,10 +5907,14 @@ class GuiTests(TempDirMixin, unittest.TestCase):
                 tab,
                 "_choose_excel_files",
                 return_value=[excel_path],
-            ), mock.patch("app.gui.excel.import_tasks", side_effect=fake_import) as import_tasks:
+            ), mock.patch("app.gui.excel.import_tasks", side_effect=fake_import) as import_tasks, mock.patch(
+                "app.gui.tabs.collect.QTimer.singleShot"
+            ) as single_shot, mock.patch("app.gui.QMessageBox") as message_box:
                 tab.import_excel()
 
             import_tasks.assert_called_once_with([excel_path], path=cfg["db_path"])
+            single_shot.assert_not_called()
+            message_box.warning.assert_not_called()
             self.assertEqual(1, tab.model.rowCount())
             self.assertEqual("alias-a", tab.model.index(0, 1).data())
             self.assertIn("1 文件", tab.summary_label.text())
@@ -5925,6 +5929,44 @@ class GuiTests(TempDirMixin, unittest.TestCase):
 
         self.assert_removed(temp_dir)
 
+    def test_collect_tab_import_error_dialog_is_delayed_one_event_loop(self):
+        with self.make_temp_dir() as temp_dir:
+            cfg = self.make_config(temp_dir)
+            excel_path = os.path.join(temp_dir, "input.xlsx")
+            statuses = []
+            tab = CollectTab(config=cfg, status_callback=statuses.append)
+            self.addCleanup(tab.close)
+
+            with mock.patch.object(tab, "_choose_excel_files", return_value=[excel_path]), mock.patch(
+                "app.gui.excel.import_tasks",
+                side_effect=RuntimeError("Excel导入失败 token=SECRET"),
+            ), mock.patch("app.gui.QMessageBox") as message_box, mock.patch(
+                "app.gui.tabs.collect.QTimer.singleShot"
+            ) as single_shot:
+                tab.import_excel()
+
+                single_shot.assert_called_once()
+                self.assertEqual(0, single_shot.call_args[0][0])
+                delayed_callback = single_shot.call_args[0][1]
+                message_box.warning.assert_not_called()
+                self.assertIn("token=***", statuses[-1])
+
+                run_log = db.list_run_logs(limit=1, run_type="import", path=cfg["db_path"])[0]
+                self.assertEqual("failed", run_log.status)
+                self.assertEqual(1, run_log.failed_count)
+                events = db.list_run_log_events(run_log.id, path=cfg["db_path"])
+                messages = "\n".join(event.message for event in events)
+                self.assertIn("step=import result=failed", messages)
+                self.assertNotIn("SECRET", messages)
+
+                delayed_callback()
+                message_box.warning.assert_called_once()
+                self.assertEqual("导入采集", message_box.warning.call_args[0][1])
+                self.assertIn("Excel导入失败", message_box.warning.call_args[0][2])
+                self.assertIn("token=***", message_box.warning.call_args[0][2])
+
+        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)