fix: incorrect post display when linking or unlinking hidden categories (#6204)

#### What type of PR is this?
/kind bug
/area core
/milestone 2.17.x

#### What this PR does / why we need it:
修复文章关联或取消关联隐藏分类后显示不正确的问题

#### Which issue(s) this PR fixes:
Fixes #6194
Fixes #6195

#### Does this PR introduce a user-facing change?
```release-note
修复文章关联或取消关联隐藏分类后显示不正确的问题
```

application/src/main/java/run/halo/app/core/extension/reconciler/CategoryReconciler.java

@@ -42,6 +42,7 @@ public class CategoryReconciler implements Reconciler<Reconciler.Request> {
             .ifPresent(category -> {
                 if (ExtensionUtil.isDeleted(category)) {
                     if (removeFinalizers(category.getMetadata(), Set.of(FINALIZER_NAME))) {
+                        refreshHiddenState(category, false);
                         client.update(category);
                     }
                     return;
@@ -50,20 +51,24 @@ public class CategoryReconciler implements Reconciler<Reconciler.Request> {
 
                 populatePermalinkPattern(category);
                 populatePermalink(category);
-                checkHideFromListState(category);
+                checkHiddenState(category);
 
                 client.update(category);
             });
         return Result.doNotRetry();
     }
 
-    /**
-     * TODO move this logic to before-create/update hook in the future see {@code gh-4343}.
-     */
-    private void checkHideFromListState(Category category) {
+    private void checkHiddenState(Category category) {
         final boolean hidden = categoryService.isCategoryHidden(category.getMetadata().getName())
             .blockOptional()
             .orElse(false);
+        refreshHiddenState(category, hidden);
+    }
+
+    /**
+     * TODO move this logic to before-create/update hook in the future see {@code gh-4343}.
+     */
+    private void refreshHiddenState(Category category, boolean hidden) {
         category.getSpec().setHideFromList(hidden);
         if (isHiddenStateChanged(category)) {
             publishHiddenStateChangeEvent(category);

application/src/main/java/run/halo/app/core/extension/reconciler/PostReconciler.java

@@ -28,6 +28,7 @@ import org.springframework.context.ApplicationEvent;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.data.domain.Sort;
 import org.springframework.stereotype.Component;
+import run.halo.app.content.CategoryService;
 import run.halo.app.content.ContentWrapper;
 import run.halo.app.content.NotificationReasonConst;
 import run.halo.app.content.PostService;
@@ -83,6 +84,7 @@ public class PostReconciler implements Reconciler<Reconciler.Request> {
     private final PostPermalinkPolicy postPermalinkPolicy;
     private final CounterService counterService;
     private final CommentService commentService;
+    private final CategoryService categoryService;
 
     private final ApplicationEventPublisher eventPublisher;
     private final NotificationCenter notificationCenter;
@@ -185,6 +187,8 @@ public class PostReconciler implements Reconciler<Reconciler.Request> {
                 status.setInProgress(
                     !StringUtils.equals(headSnapshot, post.getSpec().getReleaseSnapshot()));
 
+                computeHiddenState(post);
+
                 // version + 1 is required to truly equal version
                 // as a version will be incremented after the update
                 status.setObservedVersion(post.getMetadata().getVersion() + 1);
@@ -196,6 +200,19 @@ public class PostReconciler implements Reconciler<Reconciler.Request> {
         return Result.doNotRetry();
     }
 
+    private void computeHiddenState(Post post) {
+        var categories = post.getSpec().getCategories();
+        if (categories == null) {
+            post.getStatusOrDefault().setHideFromList(false);
+            return;
+        }
+        var hidden = categories.stream()
+            .anyMatch(categoryName -> categoryService.isCategoryHidden(categoryName)
+                .blockOptional().orElse(false)
+            );
+        post.getStatusOrDefault().setHideFromList(hidden);
+    }
+
     private void populateLabels(Post post, Set<ApplicationEvent> events) {
         var labels = nullSafeLabels(post);
         labels.put(Post.DELETED_LABEL, String.valueOf(isTrue(post.getSpec().getDeleted())));