[Enhancement]: Show/indicate missing books in a series

[raviwarrier]

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Describe the feature/enhancement

Since the app magically, already showing that the book is a part of the series, it would be nice to know which other books are in it that are missing from the library. For example:

I am sure that HBR Insights has many more books and since the app already clubbed this book as a part of the series, show additional book covers (with some kind of marking/indication for missing) in the same series. That way, one would know what is missing from their collection/library.

[raviwarrier]

This may seem like a counter to the previous request of "being able to hide/unhide series", but it's actually not. If the person chooses to make their 1-book series visible, then the thumbnail aesthetics of the series card can be improved by showing all the books in the series (with an indication of what's missing - like perhaps grayed cover, or a missing icon). On the other hand, if I didn't care about other books in the HBR Insights and just wanted this book, I could hide the series and forget about the incomplete collection.

[advplyr]

Merging this issue with #963