stub in area surface menu

src/kiri/core/conf.js

@@ -426,7 +426,8 @@ export const conf = {
                 camAreaSpindle: 1000,
                 camAreaTool: 1000,
                 camAreaMode: "clear",
-                camAreaOffset: "none",
+                camAreaTrace: "none",
+                camAreaSurface: "linear",
                 camAreaOver: 0.4,
                 camAreaDown: 1,
                 camAreaSpeed: 1000,

src/kiri/core/consts.js

@@ -126,6 +126,10 @@ const LISTS = {
         { name: "clear" },
         { name: "trace" },
         { name: "surface" }
+    ],
+    surftyp: [
+        { name: "linear" },
+        { name: "offset" },
     ]
 };