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/@girs/index.d.ts

@@ -0,0 +1,8 @@
+/**
+ * This file exports all type definitions.
+ */
+
+import './gjs.d.ts';
+import './dom.d.ts';
+import './gi.d.ts';
+import './console.d.ts';