fix(renderer): avoid inter overflow when rendering multiline strings

src/render.zig

@@ -89,7 +89,7 @@ pub fn Direct(comptime fullscreen: bool) type {
                             remaining_cols = size.cols;
                             idx = result.idx + 1; // skip over newline
                         } else {
-                            remaining_cols -= @truncate(cell_len - idx);
+                            remaining_cols -= @truncate(cell_len -| idx);
                             idx = 0;
                             break; // go to next cell
                         }