chore(release): bump version to 0.39.3

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packaging/ink-notes.metainfo.xml

@@ -84,6 +84,11 @@
   </branding>
   <content_rating type="oars-1.1" />
   <releases>
+    <release version="0.39.3" date="2026-10-27">
+      <description>
+        <p>Much lower battery use: the app no longer redraws the window continuously while nothing happens.</p>
+      </description>
+    </release>
     <release version="0.39.2" date="2026-10-27">
       <description>
         <p>PDF export now uses its own small PDF writer on lopdf 0.46 instead of printpdf; the exported files look the same.</p>