Round 12 left the sidebar header at `pt(36)` so the title row landed
two rows below the macOS traffic lights — the screenshot shows them
stacked vertically instead of sharing a row. The design renders the
dots and the workspace title side-by-side.
Tighten the header's top inset to 8 px and reserve the first 68 px of
the title row for the traffic lights via `TRAFFIC_LIGHT_RESERVE`. The
title now sits inline with the dots and the workspace picker row
follows underneath at the design's gap.