Improve robustness: add watchdog timers, error handling, and logging to prevent player freeze

signage_player/appsettings.py

@@ -12,6 +12,8 @@ class AppSettingsWindow(tk.Tk):
         self.geometry('440x600')  # Increased height for better button visibility
         self.resizable(False, False)
         self.config(bg='#23272e')
+        self.attributes('-topmost', True)
+        self.focus_force()
         self.fields = {}
         self.load_config()
         self.style = ttk.Style(self)