feat(builder): Aligning error and loading for NextJS best practices (#7894)

* feat(builder): Add skeleton loading components for Monitor views

Introduce skeleton components for Agents, Flow Runs List, and Flow Runs Status sections to enhance loading state indication. These components help improve user experience by visually outlining content placeholders while data is being fetched.

* feat(builder): Leveraging NextJS's error boundary with error.tsx

Replace the basic error page with a more detailed and interactive error component. The new component includes a retry option, a link to the homepage, and logs the error details to the console. It also aligns with NextJS standards

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Author: andrewhooker2

rnd/autogpt_builder/src/app/error.tsx

@@ -0,0 +1,43 @@
+"use client";
+
+import { useEffect } from "react";
+import { IconCircleAlert } from "@/components/ui/icons";
+import { Button } from "@/components/ui/button";
+import Link from "next/link";
+
+export default function Error({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) {
+  useEffect(() => {
+    console.error(error);
+  }, [error]);
+
+  return (
+    <div className="fixed inset-0 flex items-center justify-center bg-background">
+      <div className="w-full max-w-md px-4 text-center sm:px-6">
+        <div className="mx-auto flex size-12 items-center justify-center rounded-full bg-muted">
+          <IconCircleAlert className="size-10" />
+        </div>
+        <h1 className="mt-8 text-2xl font-bold tracking-tight text-foreground">
+          Oops, something went wrong!
+        </h1>
+        <p className="mt-4 text-muted-foreground">
+          We're sorry, but an unexpected error has occurred. Please try again
+          later or contact support if the issue persists.
+        </p>
+        <div className="mt-6 flex flex-row justify-center gap-4">
+          <Button onClick={reset} variant="outline">
+            Retry
+          </Button>
+          <Button>
+            <Link href="/">Go to Homepage</Link>
+          </Button>
+        </div>
+      </div>
+    </div>
+  );
+}

rnd/autogpt_builder/src/app/error/page.tsx

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+import AgentFlowListSkeleton from "@/components/monitor/skeletons/AgentFlowListSkeleton";
+import React from "react";
+import FlowRunsListSkeleton from "@/components/monitor/skeletons/FlowRunsListSkeleton";
+import FlowRunsStatusSkeleton from "@/components/monitor/skeletons/FlowRunsStatusSkeleton";
+
+export default function MonitorLoadingSkeleton() {
+  return (
+    <div className="space-y-4 p-4">
+      <div className="grid grid-cols-1 gap-4 md:grid-cols-3">
+        {/* Agents Section */}
+        <AgentFlowListSkeleton />
+
+        {/* Runs Section */}
+        <FlowRunsListSkeleton />
+
+        {/* Stats Section */}
+        <FlowRunsStatusSkeleton />
+      </div>
+    </div>
+  );
+}

rnd/autogpt_builder/src/app/loading.tsx

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+export default function AgentsFlowListSkeleton() {
+  return (
+    <div className="mx-auto max-w-4xl p-4">
+      <div className="mb-4 flex items-center justify-between">
+        <h1 className="text-2xl font-bold">Agents</h1>
+        <div className="h-10 w-24 animate-pulse rounded bg-gray-200"></div>
+      </div>
+      <div className="rounded-lg bg-white p-4 shadow">
+        <div className="mb-4 grid grid-cols-3 gap-4 font-medium text-gray-500">
+          <div>Name</div>
+          <div># of runs</div>
+          <div>Last run</div>
+        </div>
+        {[...Array(3)].map((_, index) => (
+          <div key={index} className="mb-4 grid grid-cols-3 gap-4">
+            <div className="h-6 animate-pulse rounded bg-gray-200"></div>
+            <div className="h-6 animate-pulse rounded bg-gray-200"></div>
+            <div className="h-6 animate-pulse rounded bg-gray-200"></div>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}

rnd/autogpt_builder/src/components/monitor/skeletons/AgentFlowListSkeleton.tsx

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+export default function FlowRunsListSkeleton() {
+  return (
+    <div className="mx-auto max-w-4xl p-4">
+      <div className="rounded-lg bg-white p-4 shadow">
+        <h2 className="mb-4 text-xl font-semibold">Runs</h2>
+        <div className="mb-4 grid grid-cols-4 gap-4 text-sm font-medium text-gray-500">
+          <div>Agent</div>
+          <div>Started</div>
+          <div>Status</div>
+          <div>Duration</div>
+        </div>
+        {[...Array(4)].map((_, index) => (
+          <div key={index} className="mb-4 grid grid-cols-4 gap-4">
+            <div className="h-5 animate-pulse rounded bg-gray-200"></div>
+            <div className="h-5 animate-pulse rounded bg-gray-200"></div>
+            <div className="h-5 animate-pulse rounded bg-gray-200"></div>
+            <div className="h-5 animate-pulse rounded bg-gray-200"></div>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}

rnd/autogpt_builder/src/components/monitor/skeletons/FlowRunsListSkeleton.tsx

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+export default function FlowRunsStatusSkeleton() {
+  return (
+    <div className="mx-auto max-w-4xl p-4">
+      <div className="rounded-lg bg-white p-4 shadow">
+        <div className="mb-6 flex items-center justify-between">
+          <h2 className="text-xl font-semibold">Stats</h2>
+          <div className="flex space-x-2">
+            {["2h", "8h", "24h", "7d", "Custom", "All"].map((btn) => (
+              <div
+                key={btn}
+                className="h-8 w-16 animate-pulse rounded bg-gray-200"
+              ></div>
+            ))}
+          </div>
+        </div>
+
+        {/* Placeholder for the line chart */}
+        <div className="mb-6 h-64 w-full animate-pulse rounded bg-gray-200"></div>
+
+        {/* Placeholders for total runs and total run time */}
+        <div className="space-y-2">
+          <div className="h-6 w-1/3 animate-pulse rounded bg-gray-200"></div>
+          <div className="h-6 w-1/2 animate-pulse rounded bg-gray-200"></div>
+        </div>
+      </div>
+    </div>
+  );
+}