refactor: 使用 performanceMonitor 替换 useFirstScreenMetrics 中的 performance.now()

- useFirstScreenMetrics: 用 performanceMonitor.mark/measure 替换手动时间计算
- useSkeletonTiming: 用 usePerformanceMark Hook 重构，支持自定义前缀
- 所有性能数据统一到 performanceMonitor，可通过 generateReport() 查看

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/hooks/useFirstScreenMetrics.ts

@@ -16,6 +16,8 @@
 import { useState, useEffect, useCallback, useRef } from 'react';
 import { initWebVitalsTracking, getCachedMetrics } from '@utils/performance/webVitals';
 import { collectResourceStats, collectApiStats } from '@utils/performance/resourceMonitor';
+import { performanceMonitor } from '@utils/performanceMonitor';
+import { usePerformanceMark } from '@hooks/usePerformanceTracker';
 import posthog from 'posthog-js';
 import type {
   FirstScreenMetrics,
@@ -44,11 +46,17 @@ export const useFirstScreenMetrics = (
   const [isLoading, setIsLoading] = useState(true);
   const [metrics, setMetrics] = useState<FirstScreenMetrics | null>(null);
 
-  // 使用 ref 记录页面加载开始时间
-  const pageLoadStartRef = useRef<number>(performance.now());
-  const skeletonStartRef = useRef<number>(performance.now());
+  // 使用 ref 避免重复标记
+  const hasMarkedRef = useRef(false);
   const hasInitializedRef = useRef(false);
 
+  // 在组件首次渲染时标记开始时间点
+  if (!hasMarkedRef.current) {
+    hasMarkedRef.current = true;
+    performanceMonitor.mark(`${pageType}-page-load-start`);
+    performanceMonitor.mark(`${pageType}-skeleton-start`);
+  }
+
   /**
    * 收集所有首屏指标
    */
@@ -82,12 +90,20 @@ export const useFirstScreenMetrics = (
         customProperties,
       });
 
-      // 5. 计算首屏可交互时间（TTI）
-      const now = performance.now();
-      const timeToInteractive = now - pageLoadStartRef.current;
+      // 5. 标记可交互时间点，并计算 TTI
+      performanceMonitor.mark(`${pageType}-interactive`);
+      const timeToInteractive = performanceMonitor.measure(
+        `${pageType}-page-load-start`,
+        `${pageType}-interactive`,
+        `${pageType} TTI`
+      ) || 0;
 
       // 6. 计算骨架屏展示时长
-      const skeletonDisplayDuration = now - skeletonStartRef.current;
+      const skeletonDisplayDuration = performanceMonitor.measure(
+        `${pageType}-skeleton-start`,
+        `${pageType}-interactive`,
+        `${pageType} 骨架屏时长`
+      ) || 0;
 
       const firstScreenMetrics: FirstScreenMetrics = {
         webVitals,
@@ -143,9 +159,9 @@ export const useFirstScreenMetrics = (
   const remeasure = useCallback(() => {
     setIsLoading(true);
 
-    // 重置计时器
-    pageLoadStartRef.current = performance.now();
-    skeletonStartRef.current = performance.now();
+    // 重置性能标记
+    performanceMonitor.mark(`${pageType}-page-load-start`);
+    performanceMonitor.mark(`${pageType}-skeleton-start`);
 
     // 延迟收集指标（等待 Web Vitals 完成）
     setTimeout(() => {
@@ -247,7 +263,7 @@ export const useFirstScreenMetrics = (
  *
  * 使用示例：
  * ```tsx
- * const { markSkeletonEnd } = useSkeletonTiming();
+ * const { markSkeletonEnd } = useSkeletonTiming('home-skeleton');
  *
  * useEffect(() => {
  *   if (!loading) {
@@ -256,27 +272,32 @@ export const useFirstScreenMetrics = (
  * }, [loading, markSkeletonEnd]);
  * ```
  */
-export const useSkeletonTiming = () => {
-  const skeletonStartRef = useRef<number>(performance.now());
-  const skeletonEndRef = useRef<number | null>(null);
+export const useSkeletonTiming = (prefix = 'skeleton') => {
+  const { mark, getMeasure } = usePerformanceMark(prefix);
+  const hasMarkedEndRef = useRef(false);
+  const hasMarkedStartRef = useRef(false);
+
+  // 在组件首次渲染时标记开始
+  if (!hasMarkedStartRef.current) {
+    hasMarkedStartRef.current = true;
+    mark('start');
+  }
 
   const markSkeletonEnd = useCallback(() => {
-    if (!skeletonEndRef.current) {
-      skeletonEndRef.current = performance.now();
-      const duration = skeletonEndRef.current - skeletonStartRef.current;
+    if (!hasMarkedEndRef.current) {
+      hasMarkedEndRef.current = true;
+      mark('end');
+      const duration = getMeasure('start', 'end');
 
-      if (process.env.NODE_ENV === 'development') {
+      if (process.env.NODE_ENV === 'development' && duration) {
         console.log(`⏱️ Skeleton Display Duration: ${(duration / 1000).toFixed(2)}s`);
       }
     }
-  }, []);
+  }, [mark, getMeasure]);
 
   const getSkeletonDuration = useCallback((): number | null => {
-    if (skeletonEndRef.current) {
-      return skeletonEndRef.current - skeletonStartRef.current;
-    }
-    return null;
-  }, []);
+    return getMeasure('start', 'end');
+  }, [getMeasure]);
 
   return {
     markSkeletonEnd,