v0.8.3

Small correctness fix to the quit timing introduced in v0.8.2.

A Finder-launched run held the process for the banner's display time even when no banner had been shown — after a result dialog the user had already dismissed, or when notifications are switched off. It now waits only while a banner is actually on screen, and quits immediately otherwise.

Install: brew install --cask nlink-jp/tap/zip-porter