feat: regreet durch moongreet ersetzen, einheitliches Default-Wallpaper

Greeter von regreet (niri-Wrapper) auf moongreet (GTK4 + gtk4-layer-shell)
umgestellt. moongreet wird direkt aus dem Gitea-Repo gebaut.

Ein einziges Wallpaper unter /usr/share/moonarch/wallpaper.jpg dient jetzt
als Default fuer Desktop (waypaper), Lockscreen (gtklock) und Greeter
(moongreet).

defaults/etc/greetd/config.toml

@@ -1,9 +1,9 @@
 # ABOUTME: greetd-Konfiguration fuer Moonarch.
-# ABOUTME: Startet regreet unter niri als Wayland-Compositor.
+# ABOUTME: Startet moongreet als Wayland-Greeter via gtk4-layer-shell.
 
 [terminal]
 vt = 1
 
 [default_session]
-command = "niri -c /etc/greetd/niri-greeter.kdl"
+command = "moongreet"
 user = "greeter"

defaults/etc/greetd/niri-greeter.kdl

@@ -1,58 +0,0 @@
-// ABOUTME: Minimale Niri-Konfiguration fuer den regreet Login-Greeter.
-// ABOUTME: Wird von greetd gestartet statt cage, um Multi-Monitor korrekt zu handhaben.
-
-input {
-    keyboard {
-        xkb {
-            layout "de"
-        }
-        numlock
-    }
-
-    touchpad {
-        tap
-        natural-scroll
-    }
-
-    mouse {
-        accel-profile "flat"
-    }
-}
-
-cursor {
-    xcursor-theme "Sweet-cursors"
-}
-
-layout {
-    gaps 0
-
-    focus-ring {
-        off
-    }
-
-    border {
-        off
-    }
-}
-
-// regreet starten und niri beenden, sobald regreet sich schliesst
-spawn-at-startup "sh" "-c" "regreet; niri msg action quit --skip-confirmation"
-
-// Greeter-Fenster maximiert darstellen
-window-rule {
-    open-maximized true
-}
-
-hotkey-overlay {
-    skip-at-startup
-}
-
-prefer-no-csd
-
-animations {
-    off
-}
-
-binds {
-    // Keine Keybinds noetig fuer den Greeter
-}

defaults/etc/greetd/regreet.css

@@ -1,40 +0,0 @@
-/* ABOUTME: Catppuccin Mocha CSS-Overrides fuer regreet. */
-/* ABOUTME: Ergaenzt das GTK-Theme mit greeter-spezifischem Styling. */
-
-window {
-    background-color: #1e1e2e;
-}
-
-entry {
-    border-radius: 8px;
-    padding: 8px 12px;
-    border: 1px solid #45475a;
-    background-color: #313244;
-    color: #cdd6f4;
-}
-
-entry:focus {
-    border-color: #b4befe;
-}
-
-button {
-    border-radius: 8px;
-    padding: 8px 16px;
-    background-color: #313244;
-    color: #cdd6f4;
-    border: 1px solid #45475a;
-}
-
-button:hover {
-    background-color: #45475a;
-}
-
-button.suggested-action {
-    background-color: #b4befe;
-    color: #1e1e2e;
-    border: none;
-}
-
-button.suggested-action:hover {
-    background-color: #89b4fa;
-}

defaults/etc/greetd/regreet.toml

@@ -1,17 +0,0 @@
-# ABOUTME: regreet-Konfiguration fuer Moonarch.
-# ABOUTME: Definiert Aussehen und Verhalten des Login-Greeters.
-
-[background]
-path = "/usr/share/backgrounds/moonarch-greeter.jpg"
-fit = "Cover"
-
-[GTK]
-application_prefer_dark_theme = true
-cursor_theme_name = "Sweet-cursors"
-font_name = "Hack Nerd Font 12"
-icon_theme_name = "Newaita-reborn-gray-dark"
-theme_name = "catppuccin-mocha-lavender-standard+default"
-
-[commands]
-reboot = ["systemctl", "reboot"]
-poweroff = ["systemctl", "poweroff"]