feat: add donation support with footer card and navigation

Add donation functionality to encourage community support, including a footer card on the home page, a highlighted "Apoiar" link in the header, and comprehensive English messages for the donation section to promote transparency and user engagement.

components/share-button.tsx

@@ -0,0 +1,26 @@
+"use client";
+
+import { Share2 } from "lucide-react";
+import { Button } from "@/components/ui/button";
+
+export function ShareButton() {
+  const handleShare = () => {
+    if (navigator.share) {
+      navigator.share({
+        title: "Tibia Trade Pagodera",
+        text: "Conheça o marketplace mais seguro para negociar itens no servidor Pagodera!",
+        url: window.location.origin,
+      });
+    } else {
+      navigator.clipboard.writeText(window.location.origin);
+      alert("Link copiado para a área de transferência!");
+    }
+  };
+
+  return (
+    <Button size="lg" variant="outline" onClick={handleShare}>
+      <Share2 className="mr-2 h-5 w-5" />
+      Compartilhar Projeto
+    </Button>
+  );
+}