shahddaghash dc21f3add2 Add preset input picker functionality
Added functionality to `Choose preset input` button. The picker allows the user to select a preset input from a list of loaded preset playlists. The selected preset input is then used to populate the ExoPlayer with the corresponding media items.

PiperOrigin-RevId: 704626144
2024-12-10 02:51:06 -08:00
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