[WEB-1657] dev: admin application code structuring. (#4867)

* [WEB-1657] dev: admin application code structuring.

* chore: update mobx-react-lite import to mobx-react.

admin/core/components/instance/instance-failure-view.tsx

@@ -0,0 +1,42 @@
+"use client";
+import { FC } from "react";
+import Image from "next/image";
+import { useTheme } from "next-themes";
+import { Button } from "@plane/ui";
+// assets
+import InstanceFailureDarkImage from "@/public/instance/instance-failure-dark.svg";
+import InstanceFailureImage from "@/public/instance/instance-failure.svg";
+
+type InstanceFailureViewProps = {
+  // mutate: () => void;
+};
+
+export const InstanceFailureView: FC<InstanceFailureViewProps> = () => {
+  const { resolvedTheme } = useTheme();
+
+  const instanceImage = resolvedTheme === "dark" ? InstanceFailureDarkImage : InstanceFailureImage;
+
+  const handleRetry = () => {
+    window.location.reload();
+  };
+
+  return (
+    <div className="h-full w-full relative container px-5 mx-auto flex justify-center items-center">
+      <div className="w-auto max-w-2xl relative space-y-8 py-10">
+        <div className="relative flex flex-col justify-center items-center space-y-4">
+          <Image src={instanceImage} alt="Plane Logo" />
+          <h3 className="font-medium text-2xl text-white ">Unable to fetch instance details.</h3>
+          <p className="font-medium text-base text-center">
+            We were unable to fetch the details of the instance. <br />
+            Fret not, it might just be a connectivity issue.
+          </p>
+        </div>
+        <div className="flex justify-center">
+          <Button size="md" onClick={handleRetry}>
+            Retry
+          </Button>
+        </div>
+      </div>
+    </div>
+  );
+};