Project · a focused card scrolls into view

The board scrolled sideways without a handle, so a card that took
focus past the fold stayed out of sight, ring and all, and Option-Right
could send it into a column nobody saw. The board now tracks its
scroll, and a card that takes focus sets the offset through
layout::bring_into_view from its row's painted box, ring included, once
per focus and again when it lands in another column. The stepping
rules gain tests for left and right keeping a card's place and for the
end of a shorter column.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/project/moves.rs

@@ -54,5 +54,20 @@ mod tests {
         assert_eq!(stepped(&lens, 2, 1, "left"), Some((1, 0)));
         assert_eq!(stepped(&lens, 2, 1, "right"), None);
         assert_eq!(stepped(&lens, 1, 0, "home"), None);
+        assert_eq!(
+            stepped(&[3, 2], 0, 1, "right"),
+            Some((1, 1)),
+            "the same place"
+        );
+        assert_eq!(
+            stepped(&[3, 2], 1, 1, "left"),
+            Some((0, 1)),
+            "the same place"
+        );
+        assert_eq!(
+            stepped(&[3, 2], 0, 2, "right"),
+            Some((1, 2)),
+            "the end of a shorter column"
+        );
     }
 }