feat: make Layan rice fully optional — move SDDM conf + fastfetch (new ANSI art logo) into euri-desktop-settings, rice deps pulled by layan pkg, netinstall gains optional 'Euri Rice' group

packages/calamares-branding-euri/netinstall.yaml

@@ -82,6 +82,21 @@
     - power-profiles-daemon-dinit
     - ntp-dinit
 
+- name: "Euri Rice (Layan)"
+  description: "Optional eye-candy: Layan/Kvantum theming, plasmoids, SDDM dark theme, shell prompt. Purely cosmetic — fully optional."
+  selected: false
+  packages:
+    - euri-layan-theme
+    - tela-circle-icon-theme-git
+    - kwin-zones
+    - oh-my-posh-bin
+    - cava
+    - python-websockets
+    - qt6-websockets
+    - kvantum
+    - yakuake
+    - mpv
+
 - name: "Utilities"
   description: "System Utilities"
   selected: true