The wait loop polled QSystemTrayIcon.isSystemTrayAvailable(), but Qt5
caches that value from the moment QApplication is constructed. At login
the autostart wins the race against wf-panel-pi's tray, so Qt caches
"no tray" permanently, the loop never escapes, and the process hangs
until the 120s timeout and exits.
Add wait_for_tray(), which polls the session bus directly (dbus-send
NameHasOwner for org.kde.StatusNotifierWatcher) before QApplication is
constructed, so Qt reports the tray correctly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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