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/modals/install-modal.tsx

@@ -0,0 +1,86 @@
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog"
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
+import { Button } from "@/components/ui/button"
+import { Download } from "lucide-react"
+
+interface InstallModalProps {
+  open: boolean;
+  onCheckAgain: () => void;
+}
+
+export function InstallModal({ open, onCheckAgain }: InstallModalProps) {
+  return (
+    <Dialog open={open}>
+      <DialogContent className="sm:max-w-[600px]">
+        <DialogHeader>
+          <DialogTitle>Ollama não encontrado</DialogTitle>
+          <DialogDescription>
+            Para usar o OllaHub, você precisa ter o Ollama instalado no seu sistema.
+            Siga os passos abaixo para o seu sistema operacional.
+          </DialogDescription>
+        </DialogHeader>
+        <Tabs defaultValue="mac" className="w-full">
+          <TabsList className="grid w-full grid-cols-3">
+            <TabsTrigger value="mac">macOS</TabsTrigger>
+            <TabsTrigger value="linux">Linux</TabsTrigger>
+            <TabsTrigger value="windows">Windows</TabsTrigger>
+          </TabsList>
+          <TabsContent value="mac" className="space-y-4 py-4">
+            <div className="space-y-2">
+              <h3 className="font-medium">1. Download e Instalação</h3>
+              <Button variant="outline" className="w-full" asChild>
+                <a href="https://ollama.com/download/Ollama-darwin.zip" target="_blank" rel="noopener noreferrer">
+                  <Download className="mr-2 h-4 w-4" />
+                  Baixar para macOS
+                </a>
+              </Button>
+            </div>
+            <div className="text-sm text-muted-foreground">
+              Após instalar, abra o terminal e digite <code>ollama serve</code> se necessário.
+            </div>
+          </TabsContent>
+          <TabsContent value="linux" className="space-y-4 py-4">
+            <div className="space-y-2">
+              <h3 className="font-medium">Instalação via Terminal</h3>
+              <div className="bg-muted p-4 rounded-md relative group">
+                <code className="text-sm break-all">curl -fsSL https://ollama.com/install.sh | sh</code>
+              </div>
+            </div>
+             <div className="space-y-2">
+              <h3 className="font-medium">Comando Manual</h3>
+               <div className="text-sm text-muted-foreground">
+                Ou consulte <a href="https://ollama.com/download/linux" className="underline text-primary" target="_blank" rel="noopener noreferrer">ollama.com/download/linux</a> para instruções manuais.
+               </div>
+            </div>
+          </TabsContent>
+          <TabsContent value="windows" className="space-y-4 py-4">
+            <div className="space-y-2">
+              <h3 className="font-medium">1. Download do Instalador</h3>
+              <Button variant="outline" className="w-full" asChild>
+                <a href="https://ollama.com/download/OllamaSetup.exe" target="_blank" rel="noopener noreferrer">
+                  <Download className="mr-2 h-4 w-4" />
+                  Baixar para Windows
+                </a>
+              </Button>
+            </div>
+            <div className="text-sm text-muted-foreground">
+              Execute o instalador baixado e siga as instruções na tela.
+            </div>
+          </TabsContent>
+        </Tabs>
+        <div className="flex justify-end gap-2 mt-4">
+            <Button onClick={onCheckAgain}>
+                Verificar Novamente
+            </Button>
+        </div>
+      </DialogContent>
+    </Dialog>
+  )
+}
+