Choose collection poster from series posters

[PhilippKammann]

Is your feature request related to a problem? Please describe.

When I want to set the poster for a collection the same as one of the included series I have to search the poster online and upload it again to Komga.

Describe the solution you'd like

Have a possibility to choose one of the series posters as the collection poster (like the mockup in the screenshot)

Describe alternatives you've considered or other apps that can do what you want

I either download the poster online or search the local artwork and then upload it to Komga

Additional context

[github-actions[bot]]

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