fix(gtk): tray-menu arrows via USER-priority counter-rule; show menu icons

Two corrections to ac7e6bd, which broke the bar it meant to spare:

1. Scoping the waybar '*' reset to 'window#waybar *' gave every reset
   property id-level specificity, so it started BEATING the later
   class rules (Boreal's pill border-radius/borders, workspace pills)
   that plain '*' correctly lost to — visibly wrecking the bar.
   Reverted all three stylesheets to the plain '*' block (bar restored
   byte-identical to pre-ac7e6bd) and instead restored the arrow where
   priority genuinely outranks waybar's stylesheet: stylix's gtk.css
   loads at USER priority (800) vs waybar's APPLICATION (600), so a
   'menu menuitem arrow { min-width/height: 16px }' there survives the
   reset in Waybar-hosted menus — the exact mechanism the neighbouring
   check/radio rule already uses for the same collapse. NB comments at
   each '*' block warn against re-scoping.

2. The 'missing icons' were never just arrows: GTK3 ships
   gtk-menu-images=false since 3.10, so image menu items (nm-applet's
   Wi-Fi list, udiskie) render iconless everywhere. Set
   gtk.gtk3.extraConfig.gtk-menu-images = 1 (merges into the
   settings.ini Stylix already writes).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

modules/home/waybar.nix

@@ -381,12 +381,13 @@ let
     /* Palette baked from theme-state.json */
     ${colorDefs}
 
-    /* Scoped to the bar window: Waybar's stylesheet applies process-wide,
-       so a bare `*` also hits the SNI tray menus Waybar hosts (nm-applet
-       & co) — `min-height: 0` there collapses the submenu arrow node to
-       invisible. Whole-swap theme waybar.css files scope the same way. */
-    window#waybar,
-    window#waybar * {
+    /* NB: this `*` reset reaches the SNI tray menus Waybar hosts too
+       (its stylesheet applies process-wide) — the menu-side damage
+       (collapsed arrows/checks) is undone by USER-priority counter-rules
+       in stylix.nix, which outrank any waybar.css. Do NOT scope this to
+       window#waybar: the id's specificity would beat the class rules
+       below (pills, workspaces) and wreck the bar. */
+    * {
       font-family: "${t.fonts.ui}", "${t.fonts.mono}";
       font-size: ${toString t.fonts.size}pt;
       min-height: 0;
@@ -499,10 +500,6 @@ let
       background: @surface;
       border: ${toString t.ui.borderSize}px solid alpha(@accent, 0.4);
       border-radius: ${toString t.ui.rounding}px;
-      /* Tooltips are separate toplevels, outside the window#waybar scope —
-         restate the bar font (calendar columns need consistent metrics). */
-      font-family: "${t.fonts.ui}", "${t.fonts.mono}";
-      font-size: ${toString t.fonts.size}pt;
     }
     tooltip label { color: @text; }
   '';