Right-hand time on the playback bar now displays the full track length
(e.g. 1:00:00) rather than the countdown (-49:39). Updated the progress-bar
click-to-seek handler to read total directly from that label instead of
deriving it from current + remaining. The canvas remaining-time display
mode is untouched.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>