feat: add proxy item check loading

src/components/base/base-loading.tsx

@@ -0,0 +1,50 @@
+import { styled } from "@mui/material";
+
+const Loading = styled("div")`
+  position: relative;
+  display: flex;
+  height: 100%;
+  min-height: 18px;
+  box-sizing: border-box;
+  align-items: center;
+
+  & > div {
+    box-sizing: border-box;
+    width: 6px;
+    height: 6px;
+    margin: 2px;
+    border-radius: 100%;
+    animation: loading 0.7s -0.15s infinite linear;
+  }
+
+  & > div:nth-child(2n-1) {
+    animation-delay: -0.5s;
+  }
+
+  @keyframes loading {
+    50% {
+      opacity: 0.2;
+      transform: scale(0.75);
+    }
+    100% {
+      opacity: 1;
+      transform: scale(1);
+    }
+  }
+`;
+
+const LoadingItem = styled("div")(({ theme }) => ({
+  background: theme.palette.text.secondary,
+}));
+
+const BaseLoading = () => {
+  return (
+    <Loading>
+      <LoadingItem />
+      <LoadingItem />
+      <LoadingItem />
+    </Loading>
+  );
+};
+
+export default BaseLoading;