Uniform compact tabs (h-7, 6px radius, 13px medium) that share the strip
width and shrink before scrolling, thin separators between inactive
neighbours that disappear around the active or hovered tab, a
hover-revealed menu button anchored to the tab's end, a soft selection
pill for the active tab, and hidden scrollbars with fade edges. The
active tab is single-line: the project/branch meta row stays only in the
VS Code header, which keeps the plain title.