feat(All) 修改结果展示样式，增加测试地区覆盖范围

src/client/App.tsx

@@ -12,11 +12,11 @@ function AppContent() {
   const [results, setResults] = useState<Map<string, LatencyResult>>(new Map())
   const [testing, setTesting] = useState(false)
 
-  const handleTest = useCallback(async (ip: string) => {
+  const handleTest = useCallback(async (target: string) => {
     setTesting(true)
     setResults(new Map())
 
-    await testAllNodes(ip, (result) => {
+    await testAllNodes(target, (result) => {
       setResults((prev) => new Map(prev).set(result.nodeId, result))
     })
 
@@ -35,7 +35,7 @@ function AppContent() {
 
       <main className="app-main">
         <p className="app-description">
-          Test network latency from global locations to any IP address
+          Test network latency from global locations to any IP address or domain
         </p>
         <IpInput onTest={handleTest} testing={testing} />
         <LatencyMap results={results} />