fix(ui): handle ttkbootstrap theme TclError during combobox popdown

Add error handling for TclError that occurs when applying themes with
ttkbootstrap combobox popdowns. This is a known issue with ttkbootstrap
where combobox popdown widgets may not exist when theme changes occur.

The error doesn't affect functionality and can be safely ignored.

Author: davidliaos

pyclashbot/interface/ui.py

@@ -811,7 +811,12 @@ def _apply_theme(self, theme_name: str, skip_variable_update: bool = False) -> N
                 self.theme_var.set(selected)
             finally:
                 self._suspend_traces -= 1
-        self._style.theme_use(selected)
+        try:
+            self._style.theme_use(selected)
+        except tk.TclError:
+            # Handle ttkbootstrap combobox popdown errors during theme changes
+            # This is a known issue with ttkbootstrap and doesn't affect functionality
+            pass
         self._refresh_theme_colours()
 
     def _label_foreground(self) -> str: