M2.1: Fix remaining Rust 1.100 Clippy lints (#6433)

Replace indexed row/cell loops with mutable iterators in the layout table
tests and the table eraser test. Test-only; no behaviour change.

crates/engine/src/cmd/table_draw.rs

@@ -765,9 +765,9 @@ mod tests {
         s.run("table.eraser", &json!({"page": 0, "x": a.right() + 0.5, "y": a.y + a.h / 2.0})).unwrap();
         let t = first_table(&s);
         assert_eq!(shape(&t), shape(&start), "no merge");
-        for r in 0..2 {
-            let right = t.rows[r].cells[0].props.borders.and_then(|b| b.right);
-            let left = t.rows[r].cells[1].props.borders.and_then(|b| b.left);
+        for (r, row) in t.rows.iter().take(2).enumerate() {
+            let right = row.cells[0].props.borders.and_then(|b| b.right);
+            let left = row.cells[1].props.borders.and_then(|b| b.left);
             assert!(right.is_some_and(|b| !b.is_visible()) && left.is_some_and(|b| !b.is_visible()), "row {r}");
         }
         assert!(t.rows[2].cells[0].props.borders.is_none(), "rows outside the edge are untouched");

crates/layout/src/tests.rs

@@ -8640,8 +8640,8 @@ fn picture_row(room: f32, min: f32, pic_h: f32, lines: usize) -> (DocLayout, Vec
         t.rows[1].props.height = Some(min);
         t.rows[1].props.height_rule = HeightRule::AtLeast;
     }
-    for c in 1..3 {
-        t.rows[1].cells[c].blocks = lines_in_cell(lines, "N/A");
+    for cell in &mut t.rows[1].cells[1..3] {
+        cell.blocks = lines_in_cell(lines, "N/A");
     }
     set_at_least_row_spacing(&mut t);
     let mut p = wordcraft_doc::Paragraph::with_text("", Default::default());
@@ -10327,8 +10327,8 @@ fn a_hidden_cell_mark_takes_no_room() {
         let mut d = Document::from_text("Above");
         let mut t = Table::new(3, 2, 300.0);
         for (r, text) in [(0, "R1"), (2, "R3")] {
-            for c in 0..2 {
-                t.rows[r].cells[c].blocks = vec![wordcraft_doc::para_block(wordcraft_doc::Paragraph::with_text(text, Default::default()))];
+            for cell in &mut t.rows[r].cells {
+                cell.blocks = vec![wordcraft_doc::para_block(wordcraft_doc::Paragraph::with_text(text, Default::default()))];
             }
         }
         for (cell, hide) in t.rows[1].cells.iter_mut().zip(hide) {