Create separate matugen toggles, add MatugenService

Matugen: add Matugen.qml as central place for templates, add
MatugenService to take care of .toml generation
Notification: possible fix for "children of null"

Assets/Matugen/Matugen.qml

@@ -0,0 +1,52 @@
+pragma Singleton
+
+import QtQuick
+import Quickshell
+import qs.Commons
+
+// Central place to define which templates we generate and where they write.
+// Users can extend it by dropping additional templates into:
+//  - Assets/Matugen/templates/
+Singleton {
+  id: root
+
+  // Build the base TOML using current settings
+  function buildConfigToml() {
+    var lines = []
+    lines.push("[config]")
+
+    // Always include noctalia colors output for the shell
+    lines.push("[templates.noctalia]")
+    lines.push('input_path = "' + Quickshell.shellDir + '/Assets/Matugen/templates/noctalia.json"')
+    lines.push('output_path = "' + Settings.configDir + 'colors.json"')
+
+    if (Settings.data.matugen.gtk4) {
+      lines.push("\n[templates.gtk4]")
+      lines.push('input_path = "' + Quickshell.shellDir + '/Assets/Matugen/templates/gtk4.css"')
+      lines.push('output_path = "~/.config/gtk-4.0/gtk.css"')
+    }
+    if (Settings.data.matugen.gtk3) {
+      lines.push("\n[templates.gtk3]")
+      lines.push('input_path = "' + Quickshell.shellDir + '/Assets/Matugen/templates/gtk3.css"')
+      lines.push('output_path = "~/.config/gtk-3.0/gtk.css"')
+    }
+    if (Settings.data.matugen.qt6) {
+      lines.push("\n[templates.qt6]")
+      lines.push('input_path = "' + Quickshell.shellDir + '/Assets/Matugen/templates/qtct.conf"')
+      lines.push('output_path = "~/.config/qt6ct/colors/noctalia.conf"')
+    }
+    if (Settings.data.matugen.qt5) {
+      lines.push("\n[templates.qt5]")
+      lines.push('input_path = "' + Quickshell.shellDir + '/Assets/Matugen/templates/qtct.conf"')
+      lines.push('output_path = "~/.config/qt5ct/colors/noctalia.conf"')
+    }
+    if (Settings.data.matugen.kitty) {
+      lines.push("\n[templates.kitty]")
+      lines.push('input_path = "' + Quickshell.shellDir + '/Assets/Matugen/templates/kitty.conf"')
+      lines.push('output_path = "~/.config/kitty/themes/noctalia.conf"')
+      lines.push("post_hook   = 'kitty +kitten themes --reload-in=all noctalia'")
+    }
+
+    return lines.join("\n") + "\n"
+  }
+}