* feat(studio): the timeline shows one row per top-level element and no child rows
* test(studio): cover the top-level id collection the timeline rows come from
* chore(studio): shorten the row-elements comment
* fix(studio): keep implicit layers as rows and say why a nested element cannot be hidden
* refactor(studio): drop implicit layers; rows are exactly what topLevelElements returns
* test(studio): untimed root wrappers are not timeline rows
* fix(studio): an empty timeline message clears the rows; drop the unused implicit contract
* fix(studio): an empty clip manifest reaches the timeline and clears the rows
* fix(studio): an empty clip manifest does not shrink the transport to its 1s floor
* chore(ci): allow deleting the child-row expansion hook and its test
Miguel Ángel
7797c5ead4