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/Bar.tsx

@@ -0,0 +1,39 @@
+import app from "ags/gtk4/app"
+import { Astal, Gtk, Gdk } from "ags/gtk4"
+import { execAsync } from "ags/process"
+import { createPoll } from "ags/time"
+
+export default function Bar(gdkmonitor: Gdk.Monitor) {
+  const time = createPoll("", 1000, "date")
+  const { TOP, LEFT, RIGHT } = Astal.WindowAnchor
+
+  return (
+    <window
+      visible
+      name="bar"
+      class="Bar"
+      gdkmonitor={gdkmonitor}
+      exclusivity={Astal.Exclusivity.EXCLUSIVE}
+      anchor={TOP | LEFT | RIGHT}
+      application={app}
+    >
+      <centerbox cssName="centerbox">
+        <button
+          $type="start"
+          onClicked={() => execAsync("echo hello").then(console.log)}
+          hexpand
+          halign={Gtk.Align.CENTER}
+        >
+          <label label="Welcome to AGS!" />
+        </button>
+        <box $type="center" />
+        <menubutton $type="end" hexpand halign={Gtk.Align.CENTER}>
+          <label label={time} />
+          <popover>
+            <Gtk.Calendar />
+          </popover>
+        </menubutton>
+      </centerbox>
+    </window>
+  )
+}