Setup LSP and clear all lint

lib/session.py

@@ -1,20 +1,12 @@
 from datetime import datetime, timedelta
-from typing import Optional, cast
+from typing import cast
 
-from PyQt6.QtCore import QModelIndex, Qt, QTime, QTimer, pyqtSignal, pyqtSlot
-from PyQt6.QtGui import (
-    QBrush,
-    QPalette,
-    QStandardItem,
-    QStandardItemModel,
-    QTextBlockFormat,
-    QTextCursor,
-    QTextDocument,
-)
+from lib import query_error
+from PyQt6.QtCore import QModelIndex, Qt, QTimer, pyqtSlot
+from PyQt6.QtGui import (QStandardItem, QStandardItemModel, QTextBlockFormat,
+                         QTextCursor, QTextDocument)
 from PyQt6.QtSql import QSqlQuery
-from PyQt6.QtWidgets import QCheckBox, QDialog, QListView, QMessageBox
-
-from main import query_error
+from PyQt6.QtWidgets import QDialog, QMessageBox
 from ui.SessionDialog import Ui_SessionDialog