Tag regen/train jobs with kind/name/jtype and add a /active-jobs endpoint listing
running ones. On Characters/Environments page load, resumeActiveJobs() re-attaches
the live progress display to any in-flight job for the matching card, so a reload
(or reopening the tab) keeps showing progress until completion.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>