fix:修复

client/app/_layout.tsx

@@ -32,7 +32,8 @@ export {
 
 export const unstable_settings = {
   // Ensure that reloading on `/modal` keeps a back button present.
-  initialRouteName: 'index',
+  // 让首次启动（未同意协议）直接进入协议页，避免先渲染 index 再跳转导致“闪一下”
+  initialRouteName: '(splash)/splash',
 };
 
 // Prevent the splash screen from auto-hiding before asset loading is complete.
@@ -144,6 +145,9 @@ function RootLayoutNav() {
   return (
     <ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
       <Stack screenOptions={{ headerShown: false }}>
+        {/* 协议页分组（首次启动优先进入） */}
+        <Stack.Screen name="(splash)" />
+
         {/* 启动分发页：根据 onboarding 状态跳转 */}
         <Stack.Screen name="index" />
 
@@ -173,7 +177,8 @@ const styles = StyleSheet.create({
     backgroundColor: '#EAD2BA',
   },
   splashImage: {
-    width: '80%',
-    height: '80%',
+    // 覆盖层图片尺寸需与系统原生 Splash 的视觉一致，避免出现“缩小一下”的错觉
+    width: '100%',
+    height: '100%',
   },
 });