Numeric dependsOn values (merge-type variations) are RFC edge values,
not ATTR names. Display them as the number, not as "ATTR: N" or
"subvariation N".
AppShell already wraps each component in div.se-pane; the inner se-pane
had display:none without .active, hiding all content.
Also drop stale movement/part/line/measure bar fields (bar IDs are opaque).
