UpdaterPage: Do not error if update check failed

src/components/ErrorCard.tsx

@@ -0,0 +1,21 @@
+import { Card } from "../webpack/common";
+
+interface Props {
+    style?: React.CSSProperties;
+    className?: string;
+}
+export function ErrorCard(props: React.PropsWithChildren<Props>) {
+    return (
+        <Card className={props.className} style={
+            {
+                padding: "2em",
+                backgroundColor: "#e7828430",
+                borderColor: "#e78284",
+                color: "var(--text-normal)",
+                ...props.style
+            }
+        }>
+            {props.children}
+        </Card>
+    );
+}