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/lib/openapi.ts

@@ -478,11 +478,12 @@ export function generateOpenApiSpec(): object {
   }));
   const FeaturePrefsRef = registry.register("FeaturePrefs", z.object({
     nutrition: z.boolean(), pantry: z.boolean(), mealPlan: z.boolean(),
-    shoppingLists: z.boolean(), collections: z.boolean(), messages: z.boolean(),
+    shoppingLists: z.boolean(), collections: z.boolean(), messages: z.boolean(), chatbots: z.boolean(),
   }).describe("Purely cosmetic — hides the feature from the user's own nav. Never restricts access to the underlying pages/routes."));
   const UpdateFeaturePrefsRef = registry.register("UpdateFeaturePrefs", z.object({
     nutrition: z.boolean().optional(), pantry: z.boolean().optional(), mealPlan: z.boolean().optional(),
     shoppingLists: z.boolean().optional(), collections: z.boolean().optional(), messages: z.boolean().optional(),
+    chatbots: z.boolean().optional(),
   }));
 
   const NutritionGoalsRef2 = registry.register("NutritionGoalsMe", z.object({