Search: Fix schema key content_type → type to match API response (#3459)

The navigation-search API serializes NavigationSearchResultItem.Type as
"type" (CamelCase policy). The previous fix incorrectly renamed the Zod
key from "type" to "content_type", causing SearchResponse.parse() to
fail on every result item.

Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: reakaleek

src/Elastic.Documentation.Site/Assets/web-components/ModalSearch/useModalSearchQuery.ts

@@ -36,7 +36,7 @@ const SearchResultItemParent = z.object({
 })
 
 const SearchResultItem = z.object({
-    content_type: z.enum(['docs']),
+    type: z.enum(['docs']),
     url: z.string(),
     title: z.string(),
     description: z.string(),

src/Elastic.Documentation.Site/Assets/web-components/NavigationSearch/NavigationSearchTelemetry.test.tsx

@@ -32,15 +32,15 @@ const mockSearchResults = {
             title: 'Elasticsearch Guide',
             description: 'Learn about Elasticsearch',
             score: 0.95,
-            content_type: 'docs' as const,
+            type: 'docs' as const,
             parents: [{ title: 'Docs' }, { title: 'Elasticsearch' }],
         },
         {
             url: '/docs/kibana/dashboard',
             title: 'Kibana Dashboard',
             description: 'Create dashboards',
             score: 0.85,
-            content_type: 'docs' as const,
+            type: 'docs' as const,
             parents: [{ title: 'Docs' }, { title: 'Kibana' }],
         },
     ],

src/Elastic.Documentation.Site/Assets/web-components/NavigationSearch/useNavigationSearchQuery.ts

@@ -40,7 +40,7 @@ const SearchResultItemParent = z.object({
 })
 
 const SearchResultItem = z.object({
-    content_type: z.enum(['docs']),
+    type: z.enum(['docs']),
     url: z.string(),
     title: z.string(),
     description: z.string(),