When the user enables "Start with Windows" in the installer, the app
launches on every PC login. Previously each login popped a fresh WebUI
tab, which is noisy for a tray-resident background service.
The autostart shortcut now passes --autostart to start-hidden.vbs, which
sets LEDGRAB_AUTOSTART=1 in the child env. __main__ checks this flag
alongside LEDGRAB_RESTART when deciding whether to open the browser.
Manual launches (desktop/start-menu shortcuts) and the installer's
post-install "Launch LedGrab" finish-page action are unchanged — they
don't pass the arg, so they still open the WebUI tab.
alexei.dolgolyov
de13f44f24