fix: add missing languageDetection/autoLabeling to getAISettings fallbacks

The error fallback and non-logged-in fallback in getAISettings were
missing languageDetection and autoLabeling fields, creating a union type
where these could be undefined — breaking the build.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

memento-note/app/actions/ai-settings.ts

@@ -199,7 +199,9 @@ const getCachedAISettings = unstable_cache(
         desktopNotifications: false,
         anonymousAnalytics: false,
         theme: 'light' as const,
-        fontSize: 'medium' as const
+        fontSize: 'medium' as const,
+        languageDetection: true,
+        autoLabeling: true,
       }
     }
   },
@@ -232,7 +234,9 @@ export async function getAISettings(userId?: string) {
       desktopNotifications: false,
       anonymousAnalytics: false,
       theme: 'light' as const,
-      fontSize: 'medium' as const
+      fontSize: 'medium' as const,
+      languageDetection: true,
+      autoLabeling: true,
     }
   }