Let menu entries appear as buttons with icon, colours and phone placement

The menu editor gets "Als Button darstellen" per entry: shape, appearance and
size from the button design, fill and ink with hover and palette, icon colour,
icon from the dialog, motion, icon-only and where the button sits on the phone
(in the opened menu, beside the burger, or there as an icon only). Colours go
into the page stylesheet under a stable per-button id because the CSP forbids
inline styles. ADR 110.

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

package.json

@@ -6,6 +6,7 @@
     "build:buttons": "node scripts/build-buttons.mjs",
     "test:buttons": "node scripts/button-check.mjs",
     "test:button-icons": "node scripts/button-icon-check.mjs",
+    "test:menu-buttons": "node scripts/menu-button-check.mjs",
     "build:icons": "node scripts/build-icons.mjs",
     "test:navigation-ux": "node scripts/navigation-ux-check.mjs",
     "test:responsive-navigation": "node scripts/responsive-navigation-check.mjs",