niri: move steam toasts to the bottom right

templates/.config/niri/config.kdl.j2

@@ -191,6 +191,11 @@ spawn-at-startup "pipewire-pulse"
 spawn-at-startup "wireplumber"
 spawn-at-startup "qs" "-c" "noctalia-shell" "--no-duplicate"
 
+environment {
+    QT_QPA_PLATFORM "wayland"
+    QT_QPA_PLATFORMTHEME "qt6ct"
+}
+
 cursor {
     xcursor-theme "breeze_cursors"
     xcursor-size 24
@@ -252,6 +257,19 @@ window-rule {
     open-floating true
 }
 
+window-rule {
+    match app-id="steam"
+    match title=r#"notificationtoasts_.*"#
+    open-floating true
+    default-floating-position x=0 y=0 relative-to="bottom-right"
+    focus-ring {
+        off
+    }
+    border {
+        off
+    }
+}
+
 // Example: block out two password managers from screen capture.
 // (This example rule is commented out with a "/-" in front.)
 /-window-rule {