enable udisks2 and run udiskie as a user unit

udiskie was installed but never actually launched - nothing in the dotfiles autostarts it, and services.udisks2 was off, so even once started it had no daemon to talk to. binds it to graphical-session.target (managed by uwsm) so it starts and stops with the session. only touches removable media: udisks2 reports the internal sata disks as HintSystem=true, so the drives declared in disks.nix are left alone.

modules/features/hyprland/default.nix

@@ -27,6 +27,32 @@
     services.xserver.enable = true;
     security.polkit.enable = true;
 
+    # Removable-media automounting.
+    #
+    # udiskie is only a tray frontend to the udisks2 D-Bus daemon, so the daemon
+    # has to be enabled or udiskie runs but can never mount anything. Note this
+    # covers removable media *only*: udisks2 reports the internal SATA disks as
+    # HintSystem=true, so udiskie leaves them alone. Permanently attached drives
+    # are declared in the host's disks.nix instead.
+    services.udisks2.enable = true;
+
+    # Run udiskie as a user unit rather than from the hypr autostart — it was
+    # previously only installed, never actually launched. Binding it to
+    # graphical-session.target (which UWSM manages properly) means it starts and
+    # stops with the session instead of leaking across logins.
+    systemd.user.services.udiskie = {
+      description = "udiskie removable media automounter";
+      partOf = ["graphical-session.target"];
+      after = ["graphical-session.target"];
+      wantedBy = ["graphical-session.target"];
+      serviceConfig = {
+        Type = "simple";
+        # -s = smart tray: the icon appears only while removable media is present.
+        ExecStart = "${pkgs.udiskie}/bin/udiskie -s";
+        Restart = "on-failure";
+      };
+    };
+
     environment.systemPackages = with pkgs; [
       # hypr* ecosystem (keybinds / hypridle / autostart)
       hyprlock