chore: vendor client into main repo

client/components/ExternalLink.tsx

@@ -0,0 +1,26 @@
+import { Link } from 'expo-router';
+import * as WebBrowser from 'expo-web-browser';
+import React from 'react';
+import { Platform } from 'react-native';
+
+export function ExternalLink(
+  props: Omit<React.ComponentProps<typeof Link>, 'href'> & { href: string }
+) {
+  return (
+    <Link
+      target="_blank"
+      {...props}
+      // expo-router 的 Link 类型会限制 href（主要用于站内路由）
+      // 这里明确把 href 视为外部链接（字符串），并由 onPress 接管打开逻辑
+      href={props.href as any}
+      onPress={(e) => {
+        if (Platform.OS !== 'web') {
+          // Prevent the default behavior of linking to the default browser on native.
+          e.preventDefault();
+          // Open the link in an in-app browser.
+          WebBrowser.openBrowserAsync(props.href);
+        }
+      }}
+    />
+  );
+}