Devcards 0.2.6 doesn't work with shadow-cljs

The required namespace "cljsjs.marked" is not available, it was required by "devcards/util/markdown.cljs".
The namespace was provided via :foreign-libs which is not supported.
Please refer to https://shadow-cljs.github.io/docs/UsersGuide.html#cljsjs fo more information.

Start with devcards/util/markdown.cljs and the shadow-cljs cljsjs guidance linked in the issue; trace how the cljsjs.marked namespace is supplied and why foreign-libs are rejected. Done means Devcards 0.2.6 builds and runs with shadow-cljs without the missing-namespace error.

Written by the indexing model from the issue text.