feat: MUX - Set asset upload as protected by default when Signed URLs are enabled [INTEG-3288]

[Renzo Delfino (R-Delfino95)]

Purpose

Previously, when Signed URLs were enabled in the plugin configuration, assets were uploaded as protected (signed in Mux).
However, the upload modal always defaulted to Public, ignoring that configuration.

This PR ensures that the modal now defaults to Protected (Signed) when the Signed URLs option is enabled in the plugin configuration.
Additionally, it fixes a race condition where playback signed URLs were not always retrieved properly — causing the player to fail and videos to not load.
Lastly, the mux-player-react package was updated to the latest version to ensure compatibility with modern browsers (e.g., Chrome now supports native HLS playback).

Approach

• Updated the modal logic to respect the Signed URLs configuration and set Protected as the default upload option when applicable.
• Fixed a race condition during signed playback retrieval to ensure consistent playback behavior.
• Updated mux-player-react to the latest stable version to avoid playback issues with browsers supporting native HLS.

Testing steps

1. Enable Signed URLs in the plugin configuration.
2. Create a new entry using the plugin and upload a video.
   • In Privacy Settings, the default option should be Protected.
3. Disable Signed URLs in the plugin configuration.
4. Create another entry and upload a video.
   • In Privacy Settings, the default option should now be Public.
5. With a Protected video, refresh the page or open the entry again.
   • The video should play correctly without errors.

Breaking Changes

None.
This change only affects new asset uploads and signed playback retrieval. Existing assets and configurations remain unaffected.

Deployment

No additional deployment steps required.
All changes are frontend-only; backend functions remain intact.