feat: add error and loading components for enhanced user experience

app/error.tsx

@@ -0,0 +1,56 @@
+"use client"
+
+import { Button } from "@/components/ui/button"
+import { Card } from "@/components/ui/card"
+import { AlertCircle } from "lucide-react"
+
+export default function Error({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string }
+  reset: () => void
+}) {
+  return (
+    <div className="min-h-screen w-full flex items-center justify-center bg-gray-50">
+      <Card className="w-full max-w-md p-6 bg-white shadow-lg">
+        {/* Icône d'erreur */}
+        <div className="flex justify-center mb-6">
+          <AlertCircle className="h-12 w-12 text-red-500 animate-pulse" />
+        </div>
+
+        {/* Titre */}
+        <h2 className="text-xl font-semibold text-gray-800 mb-4 text-center">
+          {"Une erreur est survenue"}
+        </h2>
+
+        {/* Message d'erreur */}
+        <p className="text-gray-600 text-center mb-6">
+          {"Une erreur est survenue pendant l'analyse."}
+          {error?.message && (
+            <span className="block mt-2 text-sm text-gray-500">
+              Détail: {error.message}
+            </span>
+          )}
+        </p>
+
+        {/* Boutons d'action */}
+        <div className="flex flex-col sm:flex-row gap-4 justify-center">
+          <Button
+            onClick={() => reset()}
+            className="bg-green-600 hover:bg-green-700 text-white"
+          >
+            {"Réessayer"}
+          </Button>
+          <Button
+            onClick={() => (window.location.href = "/")}
+            variant="outline"
+            className="border-green-600 text-green-600 hover:bg-green-50"
+          >
+            {"Retour à l'accueil"}
+          </Button>
+        </div>
+      </Card>
+    </div>
+  )
+}

app/scan/[url]/loading.tsx

@@ -0,0 +1,40 @@
+import { Card } from "@/components/ui/card"
+
+export default function Loading() {
+  return (
+    <div className="min-h-screen w-full flex items-center justify-center bg-gray-50">
+      <Card className="w-full max-w-md p-6 bg-white shadow-lg relative overflow-hidden">
+        {/* Barre de progression animée */}
+        <div className="h-1 w-full bg-gray-100 mb-6 overflow-hidden">
+          <div
+            className="h-full bg-green-500 w-full animate-[shimmer_2s_infinite]
+                        relative before:absolute before:inset-0 
+                        before:translate-x-[-100%] before:bg-gradient-to-r 
+                        before:from-transparent before:via-green-500 before:to-transparent
+                        before:animate-[shimmer_2s_infinite]"
+          />
+        </div>
+
+        {/* Titre */}
+        <h2 className="text-xl font-semibold text-gray-800 mb-4">
+          {"Calcul d'éco-conception en cours"}
+        </h2>
+
+        {/* Indicateur de chargement rotatif */}
+        <div className="flex justify-center mb-6">
+          <div className="w-12 h-12 border-4 border-green-200 border-t-green-500 rounded-full animate-spin" />
+        </div>
+
+        {/* Message */}
+        <p className="text-gray-600 text-center">
+          {"Cette analyse peut prendre jusqu'à une minute."}
+          <br />
+          {"Merci de patienter..."}
+        </p>
+
+        {/* Effet de pulsation */}
+        <div className="absolute inset-0 bg-green-100 opacity-20 animate-pulse" />
+      </Card>
+    </div>
+  )
+}