fix: remove duplicate close button from buy credits modal

frontend/src/app/dashboard/components/BuyCreditsModal.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { Coffee, ExternalLink, X } from "lucide-react";
+import { Coffee, ExternalLink } from "lucide-react";
 import {
 	Dialog,
 	DialogContent,
@@ -35,18 +35,9 @@ export function BuyCreditsModal({ open, onOpenChange }: BuyCreditsModalProps) {
 		<Dialog open={open} onOpenChange={onOpenChange}>
 			<DialogContent className="rounded-[2rem] border-4 border-foreground bg-card p-0 shadow-[12px_12px_0px_0px_rgba(0,0,0,0.1)] max-w-md">
 				<DialogHeader className="bg-primary/10 border-b-4 border-foreground p-6">
-					<div className="flex items-center justify-between">
-						<DialogTitle className="font-display text-3xl uppercase italic text-primary">
-							Stock the Coop
-						</DialogTitle>
-						<button
-							type="button"
-							onClick={() => onOpenChange(false)}
-							className="rounded-full p-2 hover:bg-background transition-colors"
-						>
-							<X className="h-6 w-6" />
-						</button>
-					</div>
+					<DialogTitle className="font-display text-3xl uppercase italic text-primary">
+						Stock the Coop
+					</DialogTitle>
 					<p className="text-sm font-bold text-muted-foreground mt-2">
 						100 $COOP per dollar. Use same email as Plex for auto-delivery.
 					</p>