better window centering

Author: Adam-Color

src/core/screens/sessions_window.py

@@ -1,5 +1,5 @@
 import tkinter as tk
-from core.utils.tk_utils import messagebox
+from core.utils.tk_utils import messagebox, center
 from core.utils.file_utils import get_sessions, get_sessions_directory, get_session_project, get_projects
 from core.utils.time_utils import format_time
 
@@ -311,7 +311,7 @@ def show_move_session_dialog(self, session_name, current_project, available_proj
         dialog.resizable(False, False)
 
         # Center the dialog
-        dialog.transient(self)
+        center(dialog)
         dialog.grab_set()
 
         # Main frame

src/core/utils/tk_utils.py

@@ -3,15 +3,15 @@
 import os
 import sys
 
-def center(win, offset_x=0, offset_y_percent=0):
+def center(win, offset_x=0, offset_y=0):
     """
     Center a Tkinter window on the screen with optional percentage offsets.
 
     Args:
         win (tk.Tk or tk.Toplevel): The window to center.
         offset_x (float): Horizontal offset as a percentage of the screen width.
                                   Positive = move right, negative = move left.
-        offset_y_percent (float): Vertical offset as a percentage of the screen height.
+        offset_y (float): Vertical offset as a percentage of the screen height.
                                   Positive = move down, negative = move up.
     """
     win.update_idletasks()
@@ -24,7 +24,7 @@ def center(win, offset_x=0, offset_y_percent=0):
 
     # Convert percentage offsets to pixels
     offset_x = int(screen_width * (offset_x / 100))
-    offset_y = int(screen_height * (offset_y_percent / 100))
+    offset_y = int(screen_height * (offset_y / 100))
 
     # Compute center position
     x = int((screen_width / 2) - (width / 2) + offset_x)