fix: desktop nav ignored feature toggles; add chatbots toggle (v0.62.0)

Feature toggles (Settings -> Features) were filtered into
visibleNavItems but the desktop horizontal nav still mapped over the
raw NAV_ITEMS list, so hiding a feature only worked on mobile. Both
nav renders now read the same filtered list.

Also adds a Chatbots toggle covering the recipe cooking-chat panel
and the recipe-list cooking assistant, wired end-to-end (schema,
migration, feature-prefs lib, API route, settings form, i18n,
openapi).

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

apps/web/components/layout/nav.tsx

@@ -52,7 +52,7 @@ export function Nav() {
   // backend default — avoids a flash of items disappearing on load for the
   // (much more common) case where a user hasn't hidden anything.
   const [featurePrefs, setFeaturePrefs] = useState<FeaturePrefs>({
-    nutrition: true, pantry: true, mealPlan: true, shoppingLists: true, collections: true, messages: true,
+    nutrition: true, pantry: true, mealPlan: true, shoppingLists: true, collections: true, messages: true, chatbots: true,
   });
 
   useEffect(() => {
@@ -121,7 +121,7 @@ export function Nav() {
           <span>Epicure</span>
         </Link>
         <nav className="hidden md:flex items-center gap-1">
-          {NAV_ITEMS.map(({ href, key, icon: Icon }) => (
+          {visibleNavItems.map(({ href, key, icon: Icon }) => (
             <Link
               key={href}
               href={href}

apps/web/components/settings/feature-toggles-form.tsx

@@ -7,7 +7,7 @@ import { Switch } from "@/components/ui/switch";
 import { Label } from "@/components/ui/label";
 import type { FeatureKey, FeaturePrefs } from "@/lib/feature-prefs";
 
-const FEATURES: FeatureKey[] = ["nutrition", "pantry", "mealPlan", "shoppingLists", "collections", "messages"];
+const FEATURES: FeatureKey[] = ["nutrition", "pantry", "mealPlan", "shoppingLists", "collections", "messages", "chatbots"];
 
 export function FeatureTogglesForm() {
   const t = useTranslations("settingsForm.featureToggles");