Copy: state the AI-free stance as a confidentiality benefit; record the exploration

src/landing/Landing.tsx

@@ -598,16 +598,18 @@ export function Landing(): ReactNode {
             Your charts are <b>yours.</b>
           </h2>
           <p className={styles.creedLede}>
-            Astrolabe runs in your browser, and what it makes is ordinary Vega-Lite JSON — read it,
-            edit it in other tools, or take it elsewhere whenever you want.
+            Astrolabe runs in your browser, and your charts and data stay there — no account, no
+            server, no AI behind it to send them to — so work that has to stay confidential is safe
+            here from the first chart. And what it makes is ordinary Vega-Lite JSON: read it, edit
+            it in other tools, or take it elsewhere whenever you want.
           </p>
           <div className={styles.creedGrid}>
             <div>
               <span className={styles.creedKey}>private</span>
               <h3>Local to your browser</h3>
               <p>
-                Charts, data, and themes are saved in this browser, and it keeps working offline
-                once installed.
+                Charts, data, and themes are saved in this browser and nowhere else — there is no
+                server behind Astrolabe to receive them. It keeps working offline once installed.
               </p>
             </div>
             <div>