The hide shorts feature is no longer working due to API changes that prevent reliable detection of short videos. This commit introduces a feature flag system to disable the functionality while preserving the ability to easily restore it if the API issue is resolved.
Changes:
- Add FeatureFlags.swift with hideShortsEnabled flag (currently disabled)
- Hide all HideShortsButtons UI elements when flag is disabled
- Disable shorts filtering logic in ContentItemView, FavoriteItemView, and FeedModel
- Preserve hideShorts user preference for future restoration