Add menu item allergens, drop nav Help link, animate customizer price

- Menu items can now list allergens (shared catalog + join table),
  shown on the menu grid and item detail pages when applicable, and
  editable from the admin menu item form.
- Removed the top-nav "Help" link now that the footer links to it.
- The item customization page's price now uses the sliding
  AnimatedNumber, matching the basket line price.

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

drizzle/meta/_journal.json

@@ -43,6 +43,13 @@
       "when": 1789636006749,
       "tag": "0005_tan_power_man",
       "breakpoints": true
+    },
+    {
+      "idx": 6,
+      "version": "7",
+      "when": 1789637974330,
+      "tag": "0006_worried_shooting_star",
+      "breakpoints": true
     }
   ]
 }