bugfix: GET /me/bookmarks returns total count (0.19.2)

The profile overview's bookmark counter showed 0 even when the user had bookmarks because /me/bookmarks left page.total null. Repo now returns the count alongside the rows; handler uses with_total.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/src/repo/bookmark.rs

@@ -46,7 +46,7 @@ pub async fn list_for_user(
     user_id: Uuid,
     limit: i64,
     offset: i64,
-) -> AppResult<Vec<BookmarkSummary>> {
+) -> AppResult<(Vec<BookmarkSummary>, i64)> {
     let rows = sqlx::query_as::<_, BookmarkSummary>(
         r#"
         SELECT
@@ -72,7 +72,12 @@ pub async fn list_for_user(
     .bind(offset)
     .fetch_all(pool)
     .await?;
-    Ok(rows)
+    let (total,): (i64,) =
+        sqlx::query_as("SELECT count(*) FROM bookmarks WHERE user_id = $1")
+            .bind(user_id)
+            .fetch_one(pool)
+            .await?;
+    Ok((rows, total))
 }
 
 pub async fn find_owner(pool: &PgPool, id: Uuid) -> AppResult<Option<Uuid>> {