feat: add visibility check for tagging in thought creation

thoughts-backend/app/src/persistence/tag.rs

@@ -106,6 +106,7 @@ where
             thought_tag::Relation::Thought.def(),
         )
         .filter(thought::Column::CreatedAt.gte(seven_days_ago))
+        .filter(thought::Column::Visibility.eq(thought::Visibility::Public))
         .group_by(tag::Column::Name)
         .group_by(tag::Column::Id)
         .order_by_desc(Expr::col(Alias::new("count")))

thoughts-backend/app/src/persistence/thought.rs

@@ -35,11 +35,13 @@ pub async fn create_thought(
     .insert(&txn)
     .await?;
 
+    if new_thought.visibility == thought::Visibility::Public {
         let tag_names = parse_hashtags(&params.content);
         if !tag_names.is_empty() {
             let tags = find_or_create_tags(&txn, tag_names).await?;
             link_tags_to_thought(&txn, new_thought.id, tags).await?;
         }
+    }
 
     txn.commit().await?;
     Ok(new_thought)