docs: add FIXME for waybar popup

apps/waybar/default.nix

@@ -4,6 +4,7 @@
   myConfig,
   ...
 }: let
+  # FIXME: waybar overlaps fullscreen display when restarting waybar
   hakase-popup-launch = pkgs.writeShellScriptBin "hakase-popup-launch" ''
         tui_name=$1
         active_popup=$(${pkgs.hyprland}/bin/hyprctl clients -j | ${pkgs.jq}/bin/jq -r '.[] | select(.class | startswith("org.hakase.")) | .class')
@@ -22,7 +23,6 @@
             echo "same"
           fi
         }
-
     launch() {
           exec ${pkgs.util-linux}/bin/setsid uwsm-app -- xdg-terminal-exec --app-id=org.hakase.popup."''${tui_name}" -e "''${tui_name}"
         }