Fix desktop launch, app icons and keyboard parameter editing

packaging/linux/flatpak-bundle.sh

@@ -9,8 +9,9 @@
 # is built for the host architecture (x86_64 or aarch64), which must match the tarball's.
 # Needs flatpak, flatpak-builder and the SVG pixbuf loader (librsvg2-common) for the host's
 # `appstreamcli compose`; the freedesktop runtime and SDK named in the manifest are
-# installed per-user from Flathub. Unless --no-test, the bundle is then installed per-user and
-# `solvecraft-cli --version` is run inside the sandbox as a smoke test.
+# installed per-user from Flathub. Unless --no-test, the bundle is installed per-user, the CLI
+# is checked, and the desktop creates/measures a box on headless X11 and Wayland. The desktop
+# check also needs python3, dbus-x11, xvfb, xauth and weston; no screenshots are produced.
 # Manifest: packaging/linux/flatpak/ai.storyteller.solvecraft.bundle.yml.
 # Adapted from PhotoCraft's (storytold/photocraft, Apache-2.0; see ATTRIBUTION.md).
 set -euo pipefail
@@ -67,6 +68,7 @@ if [ "$TEST" = 1 ]; then
   flatpak info --user "$APP_ID"
   flatpak run --command=solvecraft-cli "$APP_ID" --version
   flatpak run --command=sh "$APP_ID" -c 'ls /app/share/applications /app/share/metainfo /app/share/mime/packages /app/share/icons/hicolor/256x256/apps /app/share/doc/solvecraft'
+  python3 "$HERE/flatpak-smoke.py" --backend both
 fi
 echo "==> done"
 ls -lh "$OUT"