chore: import original project baseline

Import the pre-repair source tree as the history baseline.
Runtime data (data/), virtualenvs, bytecode caches and logs are
gitignored so local secrets and user state stay out of the repo.

tests/smoke_mode.py

@@ -0,0 +1,94 @@
+"""offscreen 模式切换功能测试：DB 持久化 + 首条消息锁定 + worker 分派
+运行: QT_QPA_PLATFORM=offscreen python tests/smoke_mode.py
+"""
+import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
+os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
+os.environ.setdefault("HAOCODE_RENDER", "software")
+os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = "--disable-gpu"  # 绕过 AMD 核显 context lost
+os.environ.setdefault("PYTHONIOENCODING", "utf-8")
+
+# 铁律：测试不得污染真实 data/chat_history.db → DBManager 默认路径重定向到临时文件
+import tempfile as _tf  # noqa: E402
+import core.db_manager as _dbm  # noqa: E402
+_dbm._DEFAULT_DB = os.path.join(_tf.gettempdir(), f"haocode_test_smoke_mode_{os.getpid()}.db")
+
+from PyQt6.QtWidgets import QApplication  # noqa: E402
+from ui.views.main_window import MainWindow  # noqa: E402  (QtWebEngine 须先于 QApplication import 完成)
+
+app = QApplication(sys.argv)
+ok = True
+
+
+def check(name, cond):
+    global ok
+    print(("  PASS  " if cond else "  FAIL  ") + name)
+    if not cond:
+        ok = False
+
+
+window = MainWindow()
+
+# 本套件验证「默认锁定」语义：显式置 mode_switch=false，不受本机 data/config.json 影响
+# （仅内存，不会写回配置文件）
+window.config_data["mode_switch"] = False
+window._refresh_mode_button()
+
+# 1) 新建会话 → 未锁定
+window.on_new_chat_clicked()
+sid = window.current_session_id
+check("新会话未锁定 (mode=None)", window._get_current_mode() is None)
+check("按钮显示待选 Chat", "Chat" in window.btn_mode.text() and "🔒" not in window.btn_mode.text())
+
+# 2) 浮动弹窗开/关 + 选择
+window.show_mode_popup()
+check("弹窗打开", window.mode_popup.isVisible())
+window._select_mode("worker")
+check("选 worker 后按钮更新", "Worker" in window.btn_mode.text())
+check("选择后弹窗自动关闭", not window.mode_popup.isVisible())
+
+# 3) 首条发送 → 锁定
+window._lock_session_mode()
+check("发送后锁定 worker", window.db.get_session_mode(sid) == "worker")
+check("按钮显示锁定", "🔒" in window.btn_mode.text())
+
+# 4) 锁定后不可改
+window._select_mode("chat")
+check("锁定后选择无效", window.db.get_session_mode(sid) == "worker")
+
+# 5) worker 分派
+w1 = window._create_stream_worker([], "worker")
+w2 = window._create_stream_worker([], "chat")
+from core.llm_engine import AgentWorker, ChatWorker  # noqa: E402
+check("worker 模式 → AgentWorker", isinstance(w1, AgentWorker))
+check("chat 模式 → ChatWorker", isinstance(w2, ChatWorker))
+check("ChatWorker 有基础信号", all(hasattr(w2, s) for s in
+      ("chunk_received", "reasoning_received", "error_occurred")))
+check("ChatWorker 无工具信号（chat 模式不暴露）",
+      not hasattr(w2, "tool_execution_started"))
+
+# 6) 切回新会话 → 解锁
+window.on_new_chat_clicked()
+check("新会话恢复可选", window._get_current_mode() is None and "🔒" not in window.btn_mode.text())
+
+# 7) 旧会话（无 mode 列值）→ 默认 chat 路径
+window.load_messages_to_web(sid)
+check("切回已锁定会话显示锁定", window._get_current_mode() == "worker" and "🔒" in window.btn_mode.text())
+
+# 8) mode_switch=true → 中途切换放行（旧锁定会话解锁 + 选择立即落库）
+window.config_data["mode_switch"] = True
+window._refresh_mode_button()
+check("开关开启后旧会话解锁显示", "🔒" not in window.btn_mode.text())
+window._select_mode("chat")
+check("开关开启后中途切换生效", window.db.get_session_mode(sid) == "chat")
+window.config_data["mode_switch"] = False
+
+try:
+    window.close()
+except Exception:
+    pass
+app.quit()
+print("\n===== " + ("ALL PASS" if ok else "HAS FAILURES") + " =====")
+sys.exit(0 if ok else 1)