All tabs now render as full boxes at all times (muted by default,
accent when active) instead of only the active one — so every tab's
width is fixed regardless of selection, and labels never shift
column when the active tab changes. Tabs share a single vertical at
each seam; the shared corner "opens" only at the strip's leading
edge and at the active tab's own left edge, "closing" (ceding to the
tab on its left) everywhere else, so the active tab reads as lifted
in front of its neighbours.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Sonnet 5
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