The settings nav and agent overview aside tinted themselves with
bg-app-shell/70, pulling the window-chrome tone inside the content
card. Since the desktop's active tab merges into the card top
(MUL-4439), a tinted panel under the first tabs visibly broke the
tab/content seam. Zone separation stays with the hairline divider,
row hover/selected states, and the narrow column — matching the
inbox panel's existing pattern.
Co-authored-by: Lambda <lambda@multica.ai>
Co-authored-by: multica-agent <github@multica.ai>
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