docs: add Safari installation text section to landing page

Author: vveerrgg

docs/index.html

@@ -411,6 +411,9 @@ <h3>Chrome Installation</h3>
 
             <h3>Firefox Installation</h3>
             <p>Install from <a href="https://addons.mozilla.org/en-US/firefox/addon/nostrkey/" target="nostrkey-web" style="color: var(--accent);">Firefox Add-ons</a> — click "Add to Firefox" and you're done.</p>
+
+            <h3>Safari Installation (macOS)</h3>
+            <p>Install from the <a href="https://apps.apple.com/ca/app/nostrkey-web-extension/id6759624317" target="nostrkey-web" style="color: var(--accent);">Mac App Store</a> — then enable the extension in Safari → Settings → Extensions.</p>
         </section>
 
         <section>