build-appimages.sh T3/T4 smoke tests start Xvfb automatically when no
DISPLAY is set. Without xvfb in the deps array, a clean Debian/Ubuntu
host would pass the dep check but fail at smoke-test time.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Also fixes deps-debian.sh for Debian 13 (trixie): libqt6core6 was
renamed to libqt6core6t64; libgnubarcode-dev removed (not in Debian
13 repos, optional upstream dep).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Bootstraps linuxdeploy (1-alpha-20251107-1) and linuxdeploy-plugin-qt
(1-alpha-20250213-1) to scripts/.cache/ on first run. Dual-mode:
sourceable (exports $LINUXDEPLOY_BIN / $LINUXDEPLOY_PLUGIN_QT_BIN) or
executable (prints paths). Pinned dated snapshots per spec §F9 — no
rolling continuous tag.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Seth