Fixes lag and color inconsistency in trip creation game selection.
- Add pagination with 50 games per page to TripCreationViewModel
- Add displayedAvailableGames, loadInitialAvailableGames, loadMoreAvailableGames
- Update GamePickerSheet to use paginated data with infinite scroll trigger
- Show "Load more games" button with progress indicator and count
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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