Keep 2.21.5

Title details open immediately using the card's artwork and title, then load fresh metadata and optional watch history and Leaving estimates progressively.

• Hide empty collections and their jump links across Leaving, Kept, My Keeps, and Manage Library; show a helpful page empty state when nothing remains.
• Sort Leaving and Kept titles alphabetically to match Manage Library.
• Keep the selected All Keeps/My Keeps control yellow in light and dark mode.
• Match series delete buttons to the other delete buttons.
• Add the sign-in screenshot to the repository gallery.

Both native architectures passed application, security, installation, recovery, and matching-source validation. The retained image and source assets are published from the validated main commit.