fix(calamares): ship antergos-lightdm-config, update installer slides

- Add antergos-lightdm-config to packages.yaml so CI builds/publishes it
  (referenced by packagechooser_dm.conf LightDM group; without it the
  online installer hits 'target not found' for LightDM installs)
- show.qml: correct DE count (Nine -> Ten, list Plasma Minimal) and
  replace the 'Two Modes of Installation' slide that still claimed an
  offline mode that was removed

packages.yaml

@@ -17,6 +17,7 @@ packages:
   - downgrade
   - yay
   - antergos-layan-theme
+  - antergos-lightdm-config
   - tela-circle-icon-theme-git
   - kwin-zones
   - oh-my-posh-bin

packages/calamares-branding-antergos-next/show.qml

@@ -51,8 +51,8 @@ Item {
             },
             Slide {
                 title: qsTr("Desktop Environments")
-                secondaryTitle: qsTr("Nine options to choose from")
-                body: qsTr("Plasma, Xfce, Cinnamon, MATE, LXQt, i3, Sway, Hyprland, or COSMIC — pick the environment that fits your workflow during installation.")
+                secondaryTitle: qsTr("Ten options to choose from")
+                body: qsTr("Plasma, Plasma (Minimal), Xfce, Cinnamon, MATE, LXQt, i3, Sway, Hyprland, or COSMIC — pick the environment that fits your workflow during installation.")
             },
             Slide {
                 title: qsTr("Init System")
@@ -60,9 +60,9 @@ Item {
                 body: qsTr("Fast, parallel service boot with dinit. runit and s6 are also available for selection during online installation.")
             },
             Slide {
-                title: qsTr("Two Modes of Installation")
-                secondaryTitle: qsTr("Online or Offline")
-                body: qsTr("Online mode gives you full control over DE, DM, and packages. Offline mode installs Plasma with a pre-configured setup — ready to go in minutes.")
+                title: qsTr("Installation Modes")
+                secondaryTitle: qsTr("Online by default")
+                body: qsTr("All packages are installed online from the Artix and Antergos NeXT repositories, so you always get the latest versions. Choose your DE, DM, and additional packages during installation.")
             },
             Slide {
                 title: qsTr("Built on Artix Linux")