fix sddm theme and background preloading

modules/desktop-environments/hyprland/default.nix

@@ -4,13 +4,14 @@ let
 
   bing-wallpaper = pkgs.writeScriptBin "bing-wallpaper" ''
     # Directory to store wallpapers
-    IMG_PATH="/tmp/wallpaper.jpg"
+    IMG_PATH="/run/wallpaper.jpg"
 
     # Download if not already downloaded
     URL=$(curl -s "https://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1" | \
       jq -r '.images[0].url')
     FULL_URL="https://www.bing.com$URL"
     curl -s -o "$IMG_PATH" "$FULL_URL"
+    echo "Downloaded $FULL_URL to $IMG_PATH successfully"
   '';
 in
 {
@@ -28,6 +29,11 @@ in
         extraPackages = [ theme.sddm.package ];
         theme = theme.sddm.themeName;
         wayland.enable = true;
+        settings = {
+          Theme = {
+            ThemeDir = "${theme.sddm.package}/share/sddm/themes";
+          };
+        };
       };
       # Disable gdm
       gdm.enable = lib.mkForce false;
@@ -60,6 +66,7 @@ in
   systemd = {
     services = {
       preload-bing-wallpaper = {
+        enable = true;
         wants = [ "network.target" ];
         after = [ "network.target" ];
         wantedBy = [ "graphical-session.target" ];
@@ -72,6 +79,9 @@ in
         script = ''
           bing-wallpaper
         '';
+        serviceConfig = {
+          Type = "oneshot";
+        };
       };
     };
     user.services.polkit-gnome-authentication-agent-1 = {