Panel icons, trident menu button, Ctrl+Q in dbanner (0.9.4)

- Light theme: panel icons and labels are dark instead of pale grey.
- das-trident icon and das-panel-icon star|trident for the menu button.
- dbanner quits with Ctrl+Q like dprompt ("q" stays on the start screen).
- das-shell 0.4.0, das-theme 0.2.0, das-settings 0.5.0.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

srcpkgs/das-theme/files/gtk/DasOS/gtk-3.0/gtk.css

@@ -13,6 +13,21 @@
   border-top: 1px solid alpha(@panel_fg_color, 0.12);
 }
 
+/* Symbolic panel icons (tray, volume, layout) come out pale grey on the light panel. */
+.xfce4-panel,
+.xfce4-panel button,
+.xfce4-panel image,
+.xfce4-panel button image,
+.xfce4-panel label {
+  color: #1f2430;
+  opacity: 1;
+  -gtk-icon-shadow: none;
+}
+
+.xfce4-panel button:hover {
+  background-color: alpha(#1f2430, 0.1);
+}
+
 /* adw-gtk3 draws white desktop labels with a shadow, made for dark wallpapers. */
 XfdesktopIconView.view {
   color: #1f2430;