chore: sync release metadata for v2.1.57

Author: SJ

docs/appcast.xml

@@ -5,7 +5,27 @@
 
 
 
-                                                                                                                                                                                                                                <item>
+                                                                                                                                                                                                                                        <item>
+            <title>2.1.57</title>
+            <link>https://sanebar.com/download</link>
+            <pubDate>Tue, 19 May 2026 14:56:56 -0400</pubDate>
+            <sparkle:minimumSystemVersion>15.0</sparkle:minimumSystemVersion>
+            <description>
+                <![CDATA[
+                <h2>What's New</h2>
+                <ul>
+                <li>Fixes license-key paste reliability in activation and settings.</li>
+                </ul>
+                ]]>
+            </description>
+            <enclosure url="https://dist.sanebar.com/updates/SaneBar-2.1.57.zip"
+                       sparkle:version="2157"
+                       sparkle:shortVersionString="2.1.57"
+                       length="9016541"
+                       type="application/octet-stream"
+                       sparkle:edSignature="cBJ/eIbhi4xGIvQbQzcHqyziIfmp6jSza7SrG7iJuYtu3Majd9eAzjJaMn/DHogNqFsn8fn1JbAMIRn3AUz7BA=="/>
+        </item>
+<item>
             <title>2.1.56</title>
             <link>https://sanebar.com/download</link>
             <pubDate>Mon, 18 May 2026 13:10:43 -0400</pubDate>