Seek functionality in playback mode

We added seek functionality in playback mode for the (desktop) recording client delivered by embed code 2.0. This improves the playback experience by allowing the movement to a specific point in a recording by dragging across the progress bar or clicking the progress bar.

The seek functionality works on both desktop and mobile devices (when using the desktop recorder inline on iOS or Android). On mobile, it works by dragging or clicking across the entire lower half of the recorder.