fix(snap): feed gap_width and cell fade inset into snap params

Windows now abut the visible cell edges when snapping instead of
floating halfway into the grid's gap/fade band.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/server/seat.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/server/seat.rs b/src/server/seat.rs
index 84e1d11..4924f64 100644
--- a/src/server/seat.rs
+++ b/src/server/seat.rs
@@ -948,7 +948,9 @@ impl Seat {
     unsafe fn snap_params(&self) -> crate::policy::snap::SnapParams {
         let layout = &(*self.server).wm.layout;
         crate::policy::snap::SnapParams {
-            grid_scale: layout.desktop_grid_scale,
+            cell_size: layout.desktop_grid_scale,
+            gap_width: layout.desktop_gap_width as f64,
+            cell_inset: layout.desktop_cell_fade_inset as f64,
             threshold: if layout.desktop_snap { layout.desktop_snap_threshold } else { 0.0 },
             border_width: layout.border_width as f64,
         }