Fixed old AppImage icon

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Packaging/BuildAppImage.sh

@@ -23,6 +23,10 @@ podman run --rm --security-opt label=disable -v "$PWD:/src" -w /src \
 AppDir=Packaging/appimage/AppDir
 mkdir -p "$AppDir/usr/bin"
 cp build/PyInstaller/dist/SaraFem "$AppDir/usr/bin/SaraFem"
+# Both icons are copies of assets/Icon.png (Install.sh installs Icon.png), so
+# updating that one is enough.
+cp assets/Icon.png "$AppDir/sarafem.png"
+cp assets/Icon.png Packaging/appimage/Icon.png
 
 # Built under a temporary name, then renamed into place: the AppImage can't be
 # overwritten while SaraFem is running from it ("Text file busy").