[optional] Group WatchLists and More

Managing shared watch lists with partners/friends or following huge franchise lists (e.g., MCU chronological order) requires annoying manual upkeep. Once you watch an item, you have to manually delete it to keep the list clean.

This can improved by adding a "Auto Remove When Watched" option in Dynamic Lists

Main use Cases:

• A collaborative watchlist for couples or groups.

• Fork a franchise list, turn this on, and the list dynamically shrinks as you watch always showing what's next at the top without cluttering your main Watchlist.

• If includes smart removal rules: auto-remove titles when all members watch it (or when any member watches it).

Alternative Quick Fix: "Clear Watched" Button in list options to manually bulk-delete all watched items from that list in one click.

Implementing this will eliminates manual list maintenance, makes co-watching effortless, and keeps large watch projects tidy!