Cleaned up ColorSchemeTab, added program checks, added firefox template

Matugen: added firefox (pywalfox) template
SidePanelToggle: use ProgramCheckerService for gpu-screen-recorder
ColorSchemeTab: use NCollapsible for matugen templates, use
ProgramCheckerService to detect available programs (for matugen
templates)
NCollapsible: create collapsible category

Assets/Matugen/Matugen.qml

@@ -70,6 +70,12 @@ Singleton {
       lines.push('input_path = "' + Quickshell.shellDir + '/Assets/Matugen/templates/vesktop.css"')
       lines.push('output_path = "~/.config/vesktop/themes/noctalia.theme.css"')
     }
+    if (Settings.data.matugen.pywalfox) {
+      lines.push("\n[templates.pywalfox]")
+      lines.push('input_path = "' + Quickshell.shellDir + '/Assets/Matugen/templates/pywalfox.json"')
+      lines.push('output_path = "~/.cache/wal/colors.json"')
+      lines.push('post_hook = "pywalfox update"')
+    }
 
     return lines.join("\n") + "\n"
   }

Assets/Matugen/templates/pywalfox.json

@@ -0,0 +1,22 @@
+{
+    "wallpaper": "{{image}}",
+    "alpha": "100",
+    "colors": {
+      "color0": "{{colors.background.default.hex}}",
+      "color1": "",
+      "color2": "",
+      "color3": "",
+      "color4": "",
+      "color5": "",
+      "color6": "",
+      "color7": "",
+      "color8": "",
+      "color9": "",
+      "color10": "{{colors.primary.default.hex}}",
+      "color11": "",
+      "color12": "",
+      "color13": "{{colors.surface_bright.default.hex}}",
+      "color14": "",
+      "color15": "{{colors.on_surface.default.hex}}"
+    }
+  }