Add undo/redo stack for tag operations (assign, remove, rename, merge) with Ctrl+Z/Ctrl+Y

Tagger.py

@@ -1,18 +1,23 @@
-# Imports
-import tkinter as tk
-from tkinter import ttk
+"""
+Entry point for Tagger application.
+"""
+import sys
 
-from src.ui.gui import App
-from src.core.file_manager import list_files, FileManager
+from PySide6.QtWidgets import QApplication
+
+from src.core.file_manager import FileManager
 from src.core.tag_manager import TagManager
-from pathlib import Path
-
-class State():
-    def __init__(self) -> None:
-        self.tagmanager = TagManager()
-        self.filehandler = FileManager(self.tagmanager)
-        self.app = App(self.filehandler, self.tagmanager)
+from src.ui.main_window import MainWindow
 
 
-STATE = State()
-STATE.app.main()
+def main() -> None:
+    tagmanager = TagManager()
+    filehandler = FileManager(tagmanager)
+    app = QApplication.instance() or QApplication(sys.argv)
+    window = MainWindow(filehandler, tagmanager)
+    window.show()
+    sys.exit(app.exec())
+
+
+if __name__ == "__main__":
+    main()