refactor into classvar for mpypy (#50)

We need global state. Global vars are ugly but having in a class
variable annotated with the proper typing makes mypy happy :)

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

GPT/gpt.py

@@ -1,7 +1,7 @@
 import json
 import os
 from concurrent.futures import ThreadPoolExecutor
-from typing import Any, Literal
+from typing import Any, ClassVar, Literal
 
 import requests
 from talon import Module, actions, clip, imgui, registry, settings
@@ -11,15 +11,17 @@
 
 mod = Module()
 
-text_to_confirm = ""
+
+class GuiState:
+    text_to_confirm: ClassVar[str] = ""
 
 
 @imgui.open()
 def confirmation_gui(gui: imgui.GUI):
     gui.text("Confirm model output before pasting")
     gui.line()
     gui.spacer()
-    gui.text(text_to_confirm)
+    gui.text(GuiState.text_to_confirm)
 
     gui.spacer()
     if gui.button("Paste model output"):
@@ -73,26 +75,25 @@ def gpt_generate_shell(text_to_process: str) -> str:
 
     def add_to_confirmation_gui(model_output: str):
         """Add text to the confirmation gui"""
-        global text_to_confirm
-        text_to_confirm = model_output
+        GuiState.text_to_confirm = model_output
         confirmation_gui.show()
 
     def close_model_confirmation_gui():
         """Close the model output without pasting it"""
-        global text_to_confirm
-        text_to_confirm = ""
+        GuiState.text_to_confirm = ""
         confirmation_gui.hide()
 
     def copy_model_confirmation_gui():
         """Copy the model output to the clipboard"""
-        global text_to_confirm
-        clip.set_text(text_to_confirm)
-        text_to_confirm = ""
+        clip.set_text(GuiState.text_to_confirm)
+        GuiState.text_to_confirm = ""
+
         confirmation_gui.hide()
 
     def paste_model_confirmation_gui():
         """Paste the model output"""
-        actions.user.paste(text_to_confirm)
+        actions.user.paste(GuiState.text_to_confirm)
+        GuiState.text_to_confirm = ""
         confirmation_gui.hide()
 
     def gpt_apply_prompt(prompt: str, text_to_process: str | list[str]) -> str: