Add the connector pseudo-elements and CSS custom properties expected by
AgentsView tests: --org-chart-first-child-center-offset and
--org-chart-last-child-center-offset (with 50% defaults), the
.org-chart-children::before horizontal bar, and a per-child vertical
stub via .org-chart-children > .org-chart-node::before. The vertical
variant uses --space-sm. Mobile viewport switches overflow from hidden
to auto so it owns scroll. Unskip the two tests that asserted on these.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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