fix: address issues in model pull and chat API

- Refactored model pull logic to improve error handling and user feedback.
- Enhanced chat API to ensure better performance and reliability during message fetching.
- Updated UI components for a more intuitive user experience when interacting with models and messages.

components/landing/hero.tsx

@@ -0,0 +1,26 @@
+import { Button } from "@/components/ui/button";
+import { ArrowRight, Cpu } from "lucide-react";
+
+export function Hero({ onStart }: { onStart: () => void }) {
+  return (
+    <div className="flex flex-col items-center justify-center min-h-[60vh] text-center px-4 space-y-6 animate-in fade-in zoom-in duration-500">
+      <div className="p-4 rounded-full bg-primary/10 animate-pulse">
+        <Cpu className="w-12 h-12 text-primary" />
+      </div>
+      <h1 className="text-4xl md:text-6xl font-bold tracking-tighter bg-clip-text text-transparent bg-gradient-to-r from-primary to-primary/60">
+        OllaHub
+      </h1>
+      <p className="text-lg md:text-xl text-muted-foreground max-w-[600px]">
+        Sua interface moderna e poderosa para interagir com Ollama e Modelos de Linguagem Locais.
+      </p>
+      
+      <div className="flex gap-4 pt-4">
+        <Button size="lg" onClick={onStart} className="group text-lg px-8 h-12">
+          Iniciar Chat
+          <ArrowRight className="ml-2 w-5 h-5 transition-transform group-hover:translate-x-1" />
+        </Button>
+      </div>
+    </div>
+  );
+}
+