test: update smoke and regression suites for dual-renderer paths

Offscreen harnesses now resize+show before load, use per-instance webengine profile dirs and explicit exit codes; compaction and bash stream suites follow the renamed internals.

tests/test_error_persist.py

@@ -29,18 +29,11 @@ os.environ.setdefault("HAOCODE_RENDER", "software")
 os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = "--disable-gpu"
 os.environ.setdefault("PYTHONIOENCODING", "utf-8")
 
-# 铁律：测试不得污染真实 data/chat_history.db
-import core.db_manager as _dbm  # noqa: E402
-_DB_TMP = os.path.join(tempfile.gettempdir(), f"haocode_test_errpersist_{os.getpid()}.db")
-if os.path.exists(_DB_TMP):
-    os.remove(_DB_TMP)
-_dbm._DEFAULT_DB = _DB_TMP
-
-# 铁律：不得污染真实 data/config.json
-_CFG_TMP = os.path.join(tempfile.gettempdir(), f"haocode_test_errcfg_{os.getpid()}.json")
-with open(_CFG_TMP, "w", encoding="utf-8") as _f:
-    _f.write('{"providers": {}}')
-os.environ["HAOCODE_CONFIG_FILE"] = _CFG_TMP
+# 铁律（P0-01）：临时数据库 + 临时配置必须在 import MainWindow 之前完成
+from tests._test_env import isolate  # noqa: E402
+_TMP = isolate("errpersist", config={"providers": {}})
+_DB_TMP = _TMP["db"]
+_CFG_TMP = _TMP["config"]
 
 from PyQt6.QtWidgets import QApplication  # noqa: E402
 from PyQt6.QtTest import QTest  # noqa: E402