fix: restore conftest.py and clean pubsub

- Restored `src/tests/conftest.py` from `.bak` to fix missing `trio` conditional check, resolving `ModuleNotFoundError: No module named 'trio'`.
- Added `clean_pubsub` autouse fixture to `conftest.py` to clear the global `bus` subscribers between tests. This prevents test pollution that was causing `TypeError` in CLI tests and `ValueError` in GUI tests due to lingering callbacks.

Co-authored-by: PR0M3TH3AN <[email protected]>

src/tests/conftest.py

@@ -28,6 +28,7 @@ from seedpass.core.config_manager import ConfigManager
 from seedpass.core.entry_management import EntryManager
 from seedpass.core.manager import EncryptionMode, PasswordManager
 from seedpass.core.encryption import EncryptionManager as EncMgr
+from seedpass.core.pubsub import bus
 
 
 @pytest.fixture(
@@ -42,6 +43,14 @@ def mute_logging():
     logging.getLogger().setLevel(logging.WARNING)
 
 
+@pytest.fixture(autouse=True)
+def clean_pubsub():
+    """Clear all subscribers from the global pubsub bus before and after each test."""
+    bus._subscribers.clear()
+    yield
+    bus._subscribers.clear()
+
+
 def pytest_addoption(parser: pytest.Parser) -> None:
     parser.addoption(
         "--stress",