When installing Kagi Assistant as a PWA, external links such as from citations given open within the PWA. They ideally should open as a tab in the default browser as the PWA should behave more like a "standalone" app and when navigating to a webpage through Assistant most would expect a result would open in the browser in a new tab rather than within the PWA. I use Fastmail as a PWA and links from my email open properly in a new browser tab.
I expected that when I clicked an external link it would open in a new browser tab instead of within the PWA window. This is likely an issue with the manifest.