Fix layout canvas drag-drop: zone logic, pop-out bug, canvas height

- Fix squeeze zone pop-out: _adjacent_tile used self._drag_tile (already
  None at drop time) to exclude the dragged tile from neighbor candidates.
  Pass dragged_idx explicitly via exclude_idx param instead.

- Swap split/squeeze detection areas: outer 1/6 now triggers squeeze
  (insert-between), inner 1/6→1/3 band triggers split (bisect target).

- Extend squeeze detection to gaps between tiles and canvas edges via a
  second pass in _zone_at that expands tile rects by _LC_GAP+2 and finds
  the closest outside edge. Canvas-edge squeeze falls through to bisect.

- Dynamic canvas height: sync_panes sets height to
  max(160, n*(min_tile+gap)+2*gap) so 4+ panes never get crushed below
  minimum tile size.

- Remove _tree_grid_size cap of 12: LCM was truncated prematurely,
  causing unequal rowspans in the strip chart for 5+ panes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions