Added: Live YTPTube background preview in Options, including real-time background visibility control.
Changed: Popup and Options now share the same resized background renderer and YTPTube shell layering.
Fixed: Popup and Options shell spacing now fills the page cleanly without body or viewport padding issues.

Fixed: Firefox no longer rejects duplicate host-permission prompts during option saves.

Added: Popup preset management with custom-preset filtering, refresh, metadata caching, stale-cache fallback, and selection persistence for context-menu quick adds.
Added: Optional YTPTube backgrounds with configurable visibility, responsive shell rendering, and System, Light, or Dark themes.
Changed: Popup and Options now use a YTPTube-inspired indigo, amber, stone, and dark-shell design instead of Bulma.
Changed: Preset configuration is managed from the popup, while the documented paginated API and default fallback are supported.
Changed: Options now use API-key or legacy Basic authentication consistently, with authenticated connection testing and safer credential migration.
Changed: Options display the extension icon, use larger readable controls, and save settings before testing the connection.
Fixed: Options loading no longer overwrites fields while they are being edited.