Surface Up Next episode in V3 show interface

[vladjerca]

In the old interface, a show page had a prominent Up Next section showing the next episode to watch, plus a setting to choose between:

• Up Next based on what you have watched
• Up Next based on what has just aired

In V3 this is no longer clear or visible. Would love to bring this back - both the prominent surface and the mode setting behind it.

[vladjerca]

Implementation note: this should use the Up Next endpoint.

Important: if the show is not watchlisted, default to S1E1 - do NOT fall back to the progress endpoint.

[janobi]

Submitted a related feature request last month: #2293

[featurebase-for-github]

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