Don't attempt casting local episode and inform user about antennapod HOT 6 OPEN

If not casting, function is as expected to

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Unfortunately Cast devices can only play media files from the network. So unless AntennaPod starts a web server on your phone (which would be a significant complication), the cast device cannot access the media files.

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I'll reopen this one as if we know it's not supported, we should gracefully inform the user (and prevent attempting to cast), rather than crash.

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It doesn't crash. It says "media file not compatible with cast device"

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That's confusing as all my music players (YouTube music, vlc, and rocket player) can all cast locally saved mp3s, as can podcast addict.

Or is the initial response comment saying "Unfortunately Cast devices can only play media files from the network" speaking only about antenna pod capability, not generally?

If so, perhaps I should log this as a feature request as it seems fairly standard.

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It doesn't crash. It says "media file not compatible with cast device"

Right, sorry. I wasn't paying attention to the screenshot and assumed a crash because of the stacktrace.

I think it'd still be nice to have a targeted message about casting local files; the current dialog says 'error' while it should say 'not supported' and it doesn't mention anything about local files.

Proposal (not super convinced myself):

Cannot cast local files
Casting episodes from local feeds is currently not supported. Consider using a dedicated media player.

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