feat: make AGS colorshell configuration fully declarative

- Add complete colorshell v2.0.3 configuration to home/ags-config/
- Disable runner plugin and NightLight tile (incompatible with NixOS)
- Customize SCSS with full opacity (no transparency)
- Add dark pale blue color scheme in home/pywal-colors/
- Configure Papirus-Dark icon theme via home-manager
- Make ~/.config/ags/ immutable and managed by Nix store
- Auto-deploy pywal colors to ~/.cache/wal/colors.json

All AGS configuration is now reproducible and version controlled.

home/ags-config/widget/Separator.tsx

@@ -0,0 +1,48 @@
+import { Accessor } from "ags";
+import { Gtk } from "ags/gtk4";
+
+
+export interface SeparatorProps {
+    class?: string;
+    alpha?: number;
+    cssColor?: string;
+    orientation?: Gtk.Orientation;
+    size?: number;
+    spacing?: number;
+    margin?: number;
+    visible?: boolean | Accessor<boolean>;
+}
+
+export function Separator(props: SeparatorProps = {
+    orientation: Gtk.Orientation.HORIZONTAL
+}) {
+    props.alpha = props.alpha ? 
+        (props.alpha > 1 ? 
+            props.alpha / 100
+        : props.alpha)
+    : 1;
+
+    props.orientation = props.orientation ?? Gtk.Orientation.HORIZONTAL;
+
+    return <Gtk.Box name={"separator"} vexpand={props.orientation === Gtk.Orientation.HORIZONTAL}
+      hexpand={props.orientation === Gtk.Orientation.VERTICAL}
+      class={`separator ${ props.orientation === Gtk.Orientation.VERTICAL ? 
+        "vertical" : "horizontal" }`} visible={props.visible}
+      css={`.vertical { padding: ${props.spacing ?? 0}px ${props.margin ?? 7}px; }
+        .horizontal { padding: ${props.margin ?? 4}px ${props.spacing ?? 0}px; }`}>
+
+        <Gtk.Box class={`${props.orientation === Gtk.Orientation.VERTICAL ? 
+            "vertical"
+          : "horizontal"} ${props.class ?? ""}`}
+          vexpand={props.orientation === Gtk.Orientation.HORIZONTAL}
+          hexpand={props.orientation === Gtk.Orientation.VERTICAL}
+            
+            css={`* {
+              background: ${ props.cssColor ?? "lightgray" };
+              opacity: ${props.alpha};
+            }
+            .horizontal { min-width: ${ props.size ?? 1 }px; }
+            .vertical { min-height: ${ props.size ?? 1 }px; }`} 
+        />
+    </Gtk.Box>
+}