Previously cmake --install populated both AppDirs with both binaries,
causing the batch AppImage (57MB) to be larger than the GUI AppImage
(47MB). Add rm lines after the sanity-check block to strip the
unwanted binary from each AppDir before linuxdeploy runs.
Also prune the upstream GUI desktop files from the batch AppDir (they
reference Exec=glabels-qt which is now absent) and supply --icon-file
+ --icon-filename so --create-desktop-file resolves the icon lookup.
Both AppImages now contain only their respective binary (~33-34MB each).
Also document the QMAKE=/usr/bin/qmake6 workaround (Debian 13 Qt6
qmake discovery failure in linuxdeploy-plugin-qt).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Seth