correct tool shadow epsilon

Author: stewartoallen

src/kiri/mode/cam/work/op-area.js

@@ -142,7 +142,7 @@ class OpArea extends CamOp {
         let pinc = 1 / polys.length;
         for (let area of polys) {
             let bounds = area.getBounds3D();
-            let ts_off = toolDiam / 2 - ts_eps + (op.leave_xy ?? 0);
+            let ts_off = toolDiam / 2 + (op.leave_xy ?? 0) + ts_eps;
             let offopt = {
                 arc: 250,
                 join: roundSharps ? ClipperLib.JoinType.jtRound : undefined,