refactor main controller and main window to streamline color loading and widget initialization

main.py

@@ -2,20 +2,15 @@ import sys
 from PySide6.QtWidgets import QApplication
 
 from ui.main_window import MainWindow
-from core.database import DatabaseManager
-from core.media import MediaRepository
+from controllers.main_controller import MainController
 
 
 
 def main():
     app = QApplication(sys.argv)
-    db = DatabaseManager()
-    db.connect()
-    media_repo = MediaRepository(db)
-    media_repo.sync_media()
-
-    print(db.get_all_colors())
     window = MainWindow()
+    controller = MainController(window)
+    controller.load_colors()
     window.show()
     sys.exit(app.exec())