fix: restore ensure_ascii=False in utils jsonl helpers; remove dead _last_action from api.py

app/api.py

@@ -80,11 +80,6 @@ def _config_file() -> Path:
     return _ROOT / "config" / "label_tool.yaml"
 
 
-def reset_last_action() -> None:
-    """Reset undo state — used by tests."""
-    global _last_action
-    _last_action = None
-
 
 def _queue_file() -> Path:
     return _DATA_DIR / "email_label_queue.jsonl"
@@ -161,9 +156,6 @@ app.include_router(imitate_router, prefix="/api/imitate")
 from app.style import router as style_router
 app.include_router(style_router, prefix="/api/style")
 
-# In-memory last-action store (single user, local tool — in-memory is fine)
-_last_action: dict | None = None
-
 
 class AccountTestRequest(BaseModel):
     account: dict

app/utils.py

@@ -106,7 +106,7 @@ def read_jsonl(path: Path) -> list[dict]:
 def write_jsonl(path: Path, records: list[dict]) -> None:
     """Write records to a JSONL file, overwriting any existing content."""
     path.parent.mkdir(parents=True, exist_ok=True)
-    content = "\n".join(json.dumps(r) for r in records)
+    content = "\n".join(json.dumps(r, ensure_ascii=False) for r in records)
     path.write_text(content + ("\n" if records else ""), encoding="utf-8")
 
 
@@ -114,4 +114,4 @@ def append_jsonl(path: Path, record: dict) -> None:
     """Append a single record to a JSONL file."""
     path.parent.mkdir(parents=True, exist_ok=True)
     with open(path, "a", encoding="utf-8") as fh:
-        fh.write(json.dumps(record) + "\n")
+        fh.write(json.dumps(record, ensure_ascii=False) + "\n")

tests/test_api.py

@@ -9,12 +9,10 @@ def reset_globals(tmp_path):
     from app import api
     from app.data import label as label_module
     api.set_data_dir(tmp_path)
-    api.reset_last_action()
     label_module.set_data_dir(tmp_path)
     label_module.set_config_dir(tmp_path)
     label_module.reset_last_action()
     yield
-    api.reset_last_action()
     label_module.reset_last_action()