Revert the page-load CSS override from the scroll fix: it caused a regression where the submit button became unreachable after labeling the last polygon. Keeping only the post-training JS reflow nudge.
Strengthen the scroll-stuck fix: add page-load CSS overriding the (version-suffixed) container/tabpanel height, and retry the post-training reflow nudge across several delays to survive async image loading
Fix class legend: render as an image instead of HTML-in-Markdown, since the Space sanitizer strips inline style attributes and left the color swatches blank
Rename Delta/desert classes, redesign class legend, widen KNN k range to 10-100, add Kappa/F1 metrics and per-class pixel histograms, remove teacher-reference comparisons from model tabs