rebase codebase, delete trunk, move threads to backend

src/ui/dialogs/bookdata.py

@@ -1,4 +1,3 @@
-
 from PyQt6 import QtCore, QtWidgets
 
 from src.logic.dataclass import BookData
@@ -6,6 +5,7 @@ from src.logic.dataclass import BookData
 from .dialog_sources.Ui_edit_bookdata import Ui_Dialog
 from src import Icon
 
+
 class BookDataUI(QtWidgets.QDialog, Ui_Dialog):
     def __init__(self, parent=None):
         super().__init__(parent)