Admin landing — tile CTA button

Left = current hand-rolled pill in TileShell.jsx (radius-999, Geist, ~40px, box-shadow, custom hover-slide). Right = the standard shared Button — the genuine mono control-family component from the bundle (variant="primary", per-tile tint, iconRight={ArrowRight}). Mono / uppercase / radius-3 / 24px. The trailing arrow is the genuine iconRight, sized by the primitive to the control height.

Current — bespoke pill
Standard — shared Button (with iconRight arrow)

What changes: the CTA shrinks from the large rounded pill to the 24px mono house button, keeping each tile's color via tint (Auth #2563eb · Infra #475569 · Plan #d97706 · Spend #059669). Disabled tiles (Pipelines / Costs) render greyed with the correct default cursor — the current pill's cursor:not-allowed (a cursors.md violation) goes away. The shade() hover helper is deleted; the primitive owns hover.