/** * Requests notification permission, registers the FCM service worker, and * saves the resulting device token so the server can push to this browser * later — order status changes, "your driver has arrived", chat messages, * new-order alerts for drivers, and lab report-ready notices. * * Expects window.NIROG24_PUSH = { ownerType: 'user'|'driver'|'lab_staff', basePath: '' } * to be set by an inline
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