feat: Start ibus as a systemd service

config/programs/ibus.nix

@@ -0,0 +1,26 @@
+{ pkgs, ... }:
+let
+  ibusPackage = pkgs.ibus-with-plugins.override {
+    plugins = with pkgs.ibus-engines; [
+      mozc
+      table
+      table-others
+      uniemoji
+    ];
+  };
+in
+{
+  systemd.user.services.ibus = {
+    Unit = {
+      Description = "IBus daemon";
+      PartOf = [ "graphical-session.target" ];
+      Requires = [ "dbus.socket" ];
+    };
+    Install = {
+      WantedBy = [ "graphical-session.target" ];
+    };
+    Service = {
+      ExecStart = "${ibusPackage}/bin/ibus-daemon --xim";
+    };
+  };
+}

config/programs/sway.nix

@@ -3,6 +3,7 @@
     ./wl-clipboard.nix
     ./mako.nix
     ./swayidle.nix
+    ./ibus.nix
   ];
   wayland.windowManager.sway = {
     enable = true;