docs(cookbook): wire Cookbook as a top-level nav tab

Decision made on the nav-placement deferral from the previous commit: the
Cookbook gets a top-level nav tab (next to Learn) — mirroring how reference
and learn appear both as top-level tabs and as root meta.json entries.
Adds a Cookbook entry to LEFT_LINKS in navbar.tsx using the lucide ChefHat
icon (matching the section's frontmatter icon) and restores 'cookbook' to
the root docs meta.json so it also appears in the Documentation sidebar.

OSS-222

Author: contextablemark

docs/components/layout/navbar.tsx

@@ -18,7 +18,7 @@ import GithubIcon from "@/components/ui/icons/github";
 import DiscordIcon from "@/components/ui/icons/discord";
 import ExternalLinkIcon from "@/components/ui/icons/external-link";
 import BurgerMenuIcon from "@/components/ui/icons/burger-menu";
-import { BookOpenIcon, ScrollTextIcon } from "lucide-react";
+import { BookOpenIcon, ChefHatIcon, ScrollTextIcon } from "lucide-react";
 
 export interface NavbarLink {
   href: string;
@@ -48,6 +48,11 @@ export const LEFT_LINKS: NavbarLink[] = [
     label: "Learn",
     href: "/learn",
   },
+  {
+    icon: <ChefHatIcon size={16} />,
+    label: "Cookbook",
+    href: "/cookbook",
+  },
   {
     icon: <CloudIcon />,
     label: "Free Developer Access",

docs/content/docs/meta.json

@@ -5,6 +5,7 @@
     "...(root)",
     "reference",
     "learn",
+    "cookbook",
     "---Integrations---",
     "...integrations",
     "a2a",