Fix thread safety in Hyprland modules to prevent corrupted double-linked list crash

- Move GTK operations from IPC thread to GTK main thread in Window module
- Move GTK operations from IPC thread to GTK main thread in WindowCount module
- Move GTK style class operations from IPC thread to GTK main thread in Submap module
- Language and Workspaces modules already safe (only update internal state)

Co-authored-by: Alexays <13947260+Alexays@users.noreply.github.com>

include/modules/hyprland/submap.hpp

@@ -26,6 +26,7 @@ class Submap : public waybar::ALabel, public EventHandler {
   const Bar& bar_;
   util::JsonParser parser_;
   std::string submap_;
+  std::string prev_submap_;
   bool always_on_ = false;
   std::string default_submap_ = "Default";