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/0006_worried_shooting_star.sql

@@ -0,0 +1,15 @@
+CREATE TABLE "allergens" (
+	"id" serial PRIMARY KEY NOT NULL,
+	"name" text NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE "menu_item_allergens" (
+	"id" serial PRIMARY KEY NOT NULL,
+	"menu_item_id" integer NOT NULL,
+	"allergen_id" integer NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "menu_item_allergens" ADD CONSTRAINT "menu_item_allergens_menu_item_id_menu_items_id_fk" FOREIGN KEY ("menu_item_id") REFERENCES "public"."menu_items"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "menu_item_allergens" ADD CONSTRAINT "menu_item_allergens_allergen_id_allergens_id_fk" FOREIGN KEY ("allergen_id") REFERENCES "public"."allergens"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+CREATE UNIQUE INDEX "allergens_name_idx" ON "allergens" USING btree ("name");--> statement-breakpoint
+CREATE UNIQUE INDEX "menu_item_allergens_item_allergen_idx" ON "menu_item_allergens" USING btree ("menu_item_id","allergen_id");