Update appcast for version 1.2.1

🚀 Generated with [Claude Code](https://claude.ai/code)

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

Author: mblackmon

appcast.xml

@@ -4,6 +4,33 @@
         <title>WorkTreeBuddy</title>
         <description>Updates for WorkTreeBuddy</description>
         <language>en</language>
+        <item>
+            <title>Version 1.3.0</title>
+            <pubDate>Wed, 14 Aug 2025 18:50:00 +0000</pubDate>
+            <sparkle:version>8</sparkle:version>
+            <sparkle:shortVersionString>1.3.0</sparkle:shortVersionString>
+            <description><![CDATA[
+🎯 Major Update: Sparkle Auto-Update System Fixed & Enhanced
+
+✨ New Features:
+• Auto-Update System Fully Operational: The "Check for Updates..." feature now works correctly
+• Update Popups Come to Front: Update dialogs and "no updates found" alerts automatically come to the foreground
+• Comprehensive Update Debugging: Enhanced logging to track update check process for better troubleshooting
+
+🔧 Fixes & Improvements:
+• Fixed Sparkle Configuration Error: Resolved "configuration error (4)" that prevented update checking
+• Fixed Feed URL Detection: Implemented multiple fallback methods for appcast URL configuration
+• Fixed UserDefaults Integration: Added UserDefaults-based feed URL configuration for reliability
+• Window Focus Management: Update dialogs now automatically come to front when checking for updates
+• Better Error Messaging: Clear debug output shows exactly what's happening during update checks
+
+This will be the last manual update - future versions will auto-update seamlessly!
+            ]]></description>
+            <enclosure url="https://github.com/oreillymedia/worktreebuddy/releases/download/v1.3.0/WorkTreeBuddy.dmg"
+                       type="application/octet-stream"
+                       length="2955525"
+                       sparkle:edSignature="PLACEHOLDER_SIGNATURE_TO_BE_UPDATED" />
+        </item>
         <item>
             <title>Version 1.2.1</title>
             <pubDate>Thu, 14 Aug 2025 15:23:16 +0000</pubDate>