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/resources/icons/user-trash-symbolic.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg height="16px" viewBox="0 0 16 16" width="16px" xmlns="http://www.w3.org/2000/svg">
+    <g fill="#2e3436">
+        <path d="m 1 3 h 14 c 0.550781 0 1 0.449219 1 1 s -0.449219 1 -1 1 h -14 c -0.550781 0 -1 -0.449219 -1 -1 s 0.449219 -1 1 -1 z m 0 0"/>
+        <path d="m 4 4 v -1.5 c 0 -1.386719 1.113281 -2.5 2.5 -2.5 h 2.980469 c 1.382812 0 2.5 1.113281 2.5 2.5 v 1.5 h -2 v -1.5 c 0 -0.269531 -0.230469 -0.5 -0.5 -0.5 h -2.980469 c -0.269531 0 -0.5 0.230469 -0.5 0.5 v 1.5 z m 0 0"/>
+        <path d="m 4 4 v 9 c 0 0.546875 0.453125 1 1 1 h 6 c 0.546875 0 1 -0.453125 1 -1 v -9 h 2 v 9 c 0 1.660156 -1.339844 3 -3 3 h -6 c -1.660156 0 -3 -1.339844 -3 -3 v -9 z m 0 0"/>
+        <path d="m 7 7 v 5 c 0 0.277344 -0.222656 0.5 -0.5 0.5 s -0.5 -0.222656 -0.5 -0.5 v -5 c 0 -0.277344 0.222656 -0.5 0.5 -0.5 s 0.5 0.222656 0.5 0.5 z m 0 0"/>
+        <path d="m 10 7 v 5 c 0 0.277344 -0.222656 0.5 -0.5 0.5 s -0.5 -0.222656 -0.5 -0.5 v -5 c 0 -0.277344 0.222656 -0.5 0.5 -0.5 s 0.5 0.222656 0.5 0.5 z m 0 0"/>
+    </g>
+</svg>