chore: restore pub(super) on placeholders and say title tiebreak

db/src/books/page.rs

@@ -385,7 +385,7 @@ fn cursor_from_row(row: &sqlx::sqlite::SqliteRow, sort: SortKey) -> PageCursor {
 }
 
 /// `?, ?, …` of length `n`.
-fn placeholders(n: usize) -> String {
+pub(super) fn placeholders(n: usize) -> String {
     std::iter::repeat_n("?", n).collect::<Vec<_>>().join(", ")
 }
 

db/src/books/projection.rs

@@ -119,7 +119,7 @@ macro_rules! book_columns_body {
     ",
             // Projected on every listing, not just the Recently Interacted one:
             // the mobile offline replica sorts its cached rows client-side, and
-            // a row whose key is missing falls back to the id tiebreak and
+            // a row whose key is missing falls back to the title tiebreak and
             // scrambles the server order.
             interacted_at_iso_sql!(),
             " AS last_interacted_at