Chat: The chat module continues to work even after unloading.

After unloading the chat module, it still works.

Possible solution:
define a function "unload" in .__init__ file and collect all the chat module threads, stop them and a close function to close chat window.

Start by inspecting the chat module's .__init__ file and reproduce unloading the module while its threads and chat window are active. Trace the module's thread and window lifecycle, then verify that unloading stops the threads, closes the window, and prevents the chat module from continuing to work.

Written by the indexing model from the issue text.