chore(release): update appcast for 3.3.0

Author: steipete

appcast.xml

@@ -7,6 +7,20 @@
     <link>https://raw.githubusercontent.com/openclaw/Peekaboo/main/appcast.xml</link>
     <description>Peekaboo macOS app updates (Sparkle)</description>
     <language>en</language>
+    <item>
+      <title>Peekaboo 3.3.0</title>
+      <link>https://github.com/openclaw/Peekaboo/releases/tag/v3.3.0</link>
+      <sparkle:releaseNotesLink>https://github.com/openclaw/Peekaboo/releases/tag/v3.3.0</sparkle:releaseNotesLink>
+      <pubDate>Sun, 31 May 2026 23:35:05 +0000</pubDate>
+      <enclosure
+        url="https://github.com/openclaw/Peekaboo/releases/download/v3.3.0/Peekaboo-3.3.0.app.zip"
+        sparkle:version="3030099"
+        sparkle:shortVersionString="3.3.0"
+        sparkle:minimumSystemVersion="15.0"
+        length="14260543"
+        type="application/octet-stream"
+        sparkle:edSignature="0lnffOrthS95vfaTV80ZYF0XufVbEvwYYX6z498UiE6nGWsaTEOvA6LazXMbmrNKrqw+0dWASsxY0l3AEd2IAQ==" />
+    </item>
     <item>
       <title>Peekaboo 3.2.3</title>
       <link>https://github.com/openclaw/Peekaboo/releases/tag/v3.2.3</link>