fix: tag feed returns full FeedEntry with author and counts

crates/adapters/postgres/src/feed.rs

@@ -141,6 +141,41 @@ impl FeedRepository for PgFeedRepository {
 
         Ok(Paginated { items: rows.into_iter().map(row_to_entry).collect(), total, page: page.page, per_page: page.per_page })
     }
+
+    async fn tag_feed(&self, tag_name: &str, page: &PageParams, _viewer_id: Option<&UserId>) -> Result<Paginated<FeedEntry>, DomainError> {
+        let total: i64 = sqlx::query_scalar(
+            "SELECT COUNT(*) FROM thoughts t
+             JOIN thought_tags tt ON tt.thought_id = t.id
+             JOIN tags tg ON tg.id = tt.tag_id
+             WHERE tg.name = $1 AND t.visibility = 'public'"
+        )
+        .bind(tag_name)
+        .fetch_one(&self.pool)
+        .await
+        .map_err(|e| DomainError::Internal(e.to_string()))?;
+
+        let sql = format!(
+            "{FEED_SELECT}
+             JOIN thought_tags tt ON tt.thought_id = t.id
+             JOIN tags tg ON tg.id = tt.tag_id
+             WHERE tg.name = $1 AND t.visibility = 'public'
+             ORDER BY t.created_at DESC LIMIT $2 OFFSET $3"
+        );
+        let rows = sqlx::query_as::<_, FeedRow>(&sql)
+            .bind(tag_name)
+            .bind(page.limit())
+            .bind(page.offset())
+            .fetch_all(&self.pool)
+            .await
+            .map_err(|e| DomainError::Internal(e.to_string()))?;
+
+        Ok(Paginated {
+            items: rows.into_iter().map(row_to_entry).collect(),
+            total,
+            page: page.page,
+            per_page: page.per_page,
+        })
+    }
 }
 
 #[cfg(test)]