✨ Add sessions

src/window/app.py

@@ -12,6 +12,7 @@ from src.window.session import SessionWindow
 class App:
     def __init__(self, root):
         super().__init__()
+        self.list_in_session = None
         self.custom = False
         self.config = Config()
         self.session = None
@@ -79,6 +80,7 @@ class App:
             self.launch_button.config(state="disabled")
 
     def set_timer_in_seconds(self, user_data):
+        self.custom = False
         self.timer = user_data
         for button in self.buttons:
             if button['text'] == Util.format_seconds(self.timer):
@@ -90,3 +92,7 @@ class App:
     def set_custom(self, list_in_session):
         self.custom = True
         self.list_in_session = list_in_session
+        self.check_lets_draw()
+        for button in self.buttons:
+            button.config(bg="gray85")
+        self.buttons[-1].config(bg="blue")