fix: 隐藏首页动态入口失效

app/src/main/java/com/huanchengfly/tieba/post/ui/page/main/MainPage.kt

@@ -122,15 +122,21 @@ fun MainPage(
         }
     }
 
+    val pagerState = rememberPagerState()
     val hideExplore by rememberPreferenceAsState(
         key = booleanPreferencesKey("hideExplore"),
-        defaultValue = false
+        defaultValue = LocalContext.current.appPreferences.hideExplore
     )
 
-    val pagerState = rememberPagerState()
+    LaunchedEffect(hideExplore) {
+        if (pagerState.currentPage == 3 && hideExplore) {
+            pagerState.scrollToPage(2)
+        }
+    }
     val coroutineScope = rememberCoroutineScope()
     val themeColors = ExtendedTheme.colors
-    val navigationItems = remember(messageCount) {
+    val navigationItems by remember {
+        derivedStateOf {
             listOfNotNull(
                 NavigationItem(
                     id = "home",
@@ -181,6 +187,8 @@ fun MainPage(
                 ),
             ).toImmutableList()
         }
+    }
+    val pageCount by remember { derivedStateOf { navigationItems.size } }
 
     val navigationType by remember {
         derivedStateOf {
@@ -262,7 +270,7 @@ fun MainPage(
         ) { paddingValues ->
             LazyLoadHorizontalPager(
                 contentPadding = paddingValues,
-                pageCount = navigationItems.size,
+                pageCount = pageCount,
                 state = pagerState,
                 key = { navigationItems[it].id },
                 modifier = Modifier.fillMaxSize(),