nostr:npub1xdtducdnjerex88gkg2qk2atsdlqsyxqaag4h05jmcpyspqt30wscmntxy what black magic did you use to make nsec.app so incredibly persistent in the background when installed as a PWA? Can you help me make cashu.me as persistent as nsec.app so I can make NWC zaps while the wallet is closed / in the background?