[PC TV] Improve Made for TV play button and card focus

[kean]

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Fixes PCIOS-

Reworks the focused state of the Made for TV (video) episode cards on the tvOS Home/Discover screens:

• Go to podcast and the play action now sit together on the leading edge (with tighter spacing).
• The Play Episode text button is replaced with a circular play.fill icon button (.buttonBorderShape(.circle)).
• The play button is now the default focus when a card expands, so moving horizontally between episodes lands directly on Play and skips Go to podcast — previously the focus could require an extra step before you could play.

To test

1. Launch the Pocket Casts TV app and sign in.
2. On the Home screen, focus the Made for TV row.
3. Move focus left/right across the episode cards — each card should land on the circular play button by default.
4. Press select on a focused card — playback should start immediately, with no extra navigation.
5. Press left on a focused card to reach Go to podcast and confirm it still navigates to the podcast detail screen.
6. Confirm the play button renders as a perfect circle and sits close to the Go to podcast button.

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

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