core+gui+cli: animated QR will transfer (balqr/UR1/UR2/BBQR codecs, audio channel, export/import wizard)

bal/gui/qt/common.py

@@ -15,7 +15,6 @@ hosts a few GUI helpers that do not deserve a module of their own:
       (:class:`CheckAliveError` now lives in ``bal.core.checkalive``.)
 """
 
-import copy
 import enum
 import os
 import subprocess
@@ -82,6 +81,7 @@ from PyQt6.QtWidgets import (
     QAbstractItemView,
     QAbstractSpinBox,
     QApplication,
+    QButtonGroup,
     QCheckBox,
     QComboBox,
     QDateTimeEdit,
@@ -94,6 +94,7 @@ from PyQt6.QtWidgets import (
     QMenu,
     QMenuBar,
     QPushButton,
+    QRadioButton,
     QScrollArea,
     QSizePolicy,
     QSpinBox,
@@ -121,7 +122,7 @@ from ...core.heirs import (
 
 # --- Core (GUI-free) logic layer ---
 from ...core.plugin_base import BalPlugin, BalTimestamp
-from ...core.util import Util
+from ...core.util import Util, copy_structure
 from ...core.will import (
     AmountException,
     HeirChangeException,