Add tests for search_central_via_connection with search_path=None

[Copilot]

The search_path=None code path in search_central_via_connection (used when cfg["central_path"] is None for Google Drive) had no test coverage, risking silent regressions.

Changes

• New parametrized test test_search_central_none_search_path in tests/tests_integration/test_search_methods.py:
  • Mocks call_rclone_for_central_connection to return a fake directory listing
  • Asserts search_path=None doesn't raise
  • Asserts return_full_path=True returns Path objects (e.g. Path("sub-001")) rather than bare strings
  • Asserts return_full_path=False returns plain strings
  • Asserts exactly one rclone call is made

@pytest.mark.parametrize("return_full_path", [True, False])
def test_search_central_none_search_path(self, project, monkeypatch, return_full_path):
    # Simulates the Google Drive case where central_path is None
    folders, files = search_central_via_connection(
        project.cfg, None, "*", return_full_path=return_full_path
    )
    if return_full_path:
        assert all(isinstance(f, Path) for f in folders)  # Path("sub-001"), not "sub-001"
    else:
        assert all(isinstance(f, str) for f in folders)

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