refactor: clean up unused imports and improve code organization

src/logic/pdfparser.py

@@ -1,6 +1,4 @@
 # add depend path to system path
-import os
-import sys
 
 import pandas as pd
 from pdfquery import PDFQuery

src/logic/threads.py

@@ -1,6 +1,4 @@
 import os
-import sqlite3
-import time
 
 # from icecream import ic
 from omegaconf import OmegaConf
@@ -25,7 +23,6 @@ class BackgroundChecker(QThread):
 
 
 class MockAvailCheck:
-
     def __init__(
         self, links: list = None, appnumber: int = None, parent=None, books=list[dict]
     ):
@@ -83,7 +80,6 @@ class MockAvailCheck:
 
 
 class Mailer(Ui_eMailPreview):
-
     updateSignal = Signal(int)
 
     def __init__(self, data=None, parent=None):
@@ -149,7 +145,6 @@ class Mailer(Ui_eMailPreview):
 
     def createAndSendMail(self):
         import smtplib
-        import ssl
         from email.mime.multipart import MIMEMultipart
         from email.mime.text import MIMEText
 
@@ -180,7 +175,6 @@ class Mailer(Ui_eMailPreview):
 
 
 class MailThread(QThread):
-
     updateSignal = Signal(int)
 
     def __init__(self, data=None, parent=None):

src/logic/threads_copy.py

@@ -1,6 +1,4 @@
-import os
 import sqlite3
-import threading
 import time
 
 from PyQt6.QtCore import QThread, pyqtSignal
@@ -8,7 +6,6 @@ from PyQt6.QtCore import QThread, pyqtSignal
 from src.backend.database import Database
 from src.logic.log import MyLogger
 from src.logic.webrequest import BibTextTransformer, WebRequest
-from src.transformers import RDS_AVAIL_DATA
 
 # from icecream import ic
 
@@ -213,7 +210,6 @@ class AutoAdder(QThread):
 
 
 class MockAvailCheck:
-
     def __init__(
         self, links: list = None, appnumber: int = None, parent=None, books=list[dict]
     ):