release: restore ZUPT and harden source-only 5.2.2

packaging/portable/zupt-gui.command

@@ -0,0 +1,17 @@
+#!/bin/bash
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# ZUPT GUI launcher for macOS (portable package).
+# Double-clickable in Finder (.command). Requirements on the target Mac:
+#   * Python 3.9+
+#   * PySide6 or PyQt6:   python3 -m pip install PySide6
+#   * The ZUPT CLI:       `zupt` next to this file, or on PATH
+#     (Homebrew: `brew install cristiancmoises/tap/zupt`).
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+[ -x "$HERE/zupt" ] && export ZUPT_BIN="$HERE/zupt"
+
+PY="$(command -v python3 || command -v python || true)"
+if [ -z "$PY" ]; then
+  osascript -e 'display alert "ZUPT GUI" message "Python 3.9 or newer was not found. Install Python and a trusted PySide6 or PyQt6 package."' 2>/dev/null
+  echo "Python 3 not found." >&2; exit 1
+fi
+exec "$PY" "$HERE/zupt_gui.py" "$@"