style(orders): tint Open button warn-amber to match Review

Both right-hand action buttons on the order list card now share the
warn-amber treatment, so they pop against the muted card background
and the operator can spot them at a glance. The icons (AlertTriangle
for Review, ExternalLink for Open) keep the actions distinguishable.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Co-authored-by: Orca <help@stably.ai>

src/app/(app)/orders/page.tsx

@@ -822,7 +822,7 @@ function OrderCard({
             type="button"
             variant="ghost"
             size="icon"
-            className="h-8 w-8 text-muted-foreground hover:text-foreground"
+            className="h-8 w-8 text-warn-foreground hover:text-warn-foreground hover:bg-warn/10"
             onClick={(e) => {
               e.stopPropagation();
               onOpen();