docs: add building-trust card to AI Analyst index

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: lordhumunguz

ai-analyst/index.mdx

@@ -178,13 +178,16 @@ Granular access control (limiting specific users to specific stores or tables) i
 
 ## Next Steps
 
-<CardGroup cols={2}>
+<CardGroup cols={3}>
   <Card title="Example Questions" icon="lightbulb" href="/ai-analyst/what-you-can-ask">
     See examples of questions across different domains.
   </Card>
   <Card title="Understanding Results" icon="chart-simple" href="/ai-analyst/understanding-results">
     Learn how to read responses, charts, and SQL output.
   </Card>
+  <Card title="Building Trust" icon="shield" href="/ai-analyst/building-trust">
+    How to validate results and establish a reliable workflow.
+  </Card>
 </CardGroup>
 
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