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/styles/_runner.scss

@@ -0,0 +1,73 @@
+@use "./colors";
+
+.runner .popup-window-container {
+  all: unset;
+
+  $radius: 24px;
+
+  background: rgba($color: colors.$bg-primary, $alpha: .8);
+  border-radius: $radius;
+  box-shadow: inset 0 0 0 1px colors.$bg-secondary, 
+    0 0 8px 1px colors.$bg-translucent;
+
+  padding: 4px;
+
+  & entry {
+    transition: 80ms ease-in;
+    min-height: 1.6em;
+    padding: 14px;
+    border-radius: inherit;
+    background: none;
+
+    &:focus {
+      box-shadow: none;
+    }
+
+    & image {
+      margin-right: 6px;
+      -gtk-icon-size: 16px;
+    }
+  }
+
+  & scrolledwindow {
+    margin: 6px;
+  }
+
+  & list {
+    & .result {
+      padding: 10px;
+      background: colors.$bg-primary;
+      margin: 2px 0;
+      border-radius: 14px;
+
+      & image {
+        -gtk-icon-size: 28px;
+        margin-right: 6px;
+      }
+
+      & .title {
+        font-weight: 500;
+        font-size: 16px;
+      }
+
+      & .description {
+        font-size: 12px;
+        color: colors.$fg-disabled;
+      }
+    }
+
+    & > *:selected .result,
+    & > *:active .result,
+    & > *:hover .result {
+      background: colors.$bg-secondary;
+    }
+
+    & > *:first-child {
+      margin-top: 12px;
+    }
+
+    &:last-child {
+      margin-bottom: 0;
+    }
+  }
+}