Try to add ibus support.

modules/home/hyprland/start.sh

@@ -1,3 +1,10 @@
 export GDK_SCALE=2
-export XCURSOR_SIZE=16
-Hyprland
+export XCURSOR_SIZE=24
+
+export GTK_IM_MODULE=ibus
+export QT_IM_MODULE=ibus
+export XMODIFIERS=@im=ibus
+export SDL_IM_MODULE=ibus
+export GLFW_IM_MODULE=ibus
+
+exec Hyprland

modules/nixos/fonts/default.nix

@@ -42,10 +42,10 @@ in {
     };
     i18n = {
       defaultLocale = "en_US.UTF-8";
-      #inputMethod = {
-      #  enabled = "fcitx";
-      #  fcitx.engines = with pkgs.fcitx-engines; [mozc];
-      #};
+      inputMethod = {
+        enabled = "ibus";
+        ibus.engines = with pkgs.ibus-engines; [ mozc ];
+      };
     };
   };
 }