feat: Mux video offline storage (#454)

Co-authored-by: me <me@kentcdodds.com>
Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: kentcdodds

docs/video-player.md

@@ -46,6 +46,8 @@ files to embed Epic Web videos with enhanced features.
 - **Mux Integration**: Uses Mux for high-quality video playback
 - **Theme Support**: Automatically adapts to light/dark themes
 - **Offline Handling**: Graceful fallback when offline
+- **Offline Downloads (Local)**: Optional bulk downloads from Preferences for
+  offline playback, encrypted at rest
 - **Region Restrictions**: Handles region-restricted content with upgrade
   prompts