CAM routing refactor, area operation, and taper ball tool implementation

Major routing improvements:
- Refactor depth-first routing algorithm for better path optimization
- Reimplemented outline, roughing, pocket, and trace as area operation wrappers
- Add pocket shadow travel routing with optimized descent using travel bounds
- Improve contour routing with arc detection and polyEmit arc strategy
- Add area smoothing and ease-down options
- Fix outline handling with thru holes and surface reversal on tip2tip
- Move widget shadow methods into widget class for faster hole detection
- Better camInnerFirst support and proper feed/plunge defaults

Tool system improvements:
- Implement taper ball tool type with full support
- Add renderTool2() for profile-based visualization
- Convert tool menu to init code with bound vars
- Fix auto tool and auto spindle for prep operations
- Update tool profile generation for taperball geometry
- Add calcTaperBallExtent() for proper ball tangency calculations

Code cleanup:
- Remove duplicated slicer code from specialized slicers
- Asyncify shadowAt operations
- Deprecate pocket engrave operation
- Simplify upNover implementation
- Fix animation with new tool+settings requirements

src/kiri/core/conf.js

@@ -204,7 +204,6 @@ const renamed = {
     roughingOn: "camRoughOn",
     roughingOver: "camRoughOver",
     roughingPlunge: "camRoughPlunge",
-    roughingPocket: "camRoughVoid",
     roughingSpeed: "camRoughSpeed",
     roughingSpindle: "camRoughSpindle",
     roughingStock: "camRoughStock",
@@ -428,14 +427,18 @@ export const conf = {
                 camAreaMode: "clear",
                 camAreaTrace: "none",
                 camAreaSurface: "linear",
+                camAreaDirection: "climb",
                 camAreaAngle: 0,
                 camAreaOver: 0.4,
                 camAreaDown: 1,
                 camAreaSpeed: 1000,
                 camAreaPlunge: 100,
+                camAreaFollow: 15,
                 camAreaExpand: 0,
-                camAreaSmooth: 1,
                 camAreaRefine: 0,
+                camAreaSmooth: 1,
+                camAreaDogbones: false,
+                camAreaRevbones: false,
                 camAreaOutline: false,
                 camContourAngle: 85,
                 camContourBottom: false,
@@ -528,23 +531,19 @@ export const conf = {
                 camOriginOffZ: 0,
                 camOriginTop: true,
                 camOutlineDogbone: false,
+                camOutlineRevbone: false,
                 camOutlineDown: 3,
                 camOutlineIn: false,
                 camOutlineOmitThru: false,
-                camOutlineOmitVoid: false,
-                camOutlineOn: true,
-                camOutlineOut: true,
                 camOutlineOver: 0.4,
                 camOutlineOverCount: 1,
                 camOutlinePlunge: 250,
                 camOutlineSpeed: 800,
                 camOutlineSpindle: 1000,
                 camOutlineTool: 1000,
-                camOutlineTop: true,
                 camOutlineWide: false,
                 camPocketContour: false,
                 camPocketDown: 1,
-                camPocketEngrave: false,
                 camPocketExpand: 0,
                 camPocketFollow: 5,
                 camPocketOutline: false,
@@ -562,7 +561,6 @@ export const conf = {
                 camRegisterThru: 5,
                 camRoughAll: true,
                 camRoughDown: 2,
-                camRoughFlat: true,
                 camRoughIn: true,
                 camRoughOmitThru: false,
                 camRoughOmitVoid: false,
@@ -575,7 +573,6 @@ export const conf = {
                 camRoughStockZ: 0,
                 camRoughTool: 1000,
                 camRoughTop: true,
-                camRoughVoid: false,
                 camStockClipTo: false,
                 camStockIndexed: false,
                 camStockIndexGrid: true,
@@ -603,7 +600,6 @@ export const conf = {
                 camTraceType: "follow",
                 camTraceZBottom: 0,
                 camTraceZTop: 0,
-                camTrueShadow: false,
                 camZAnchor: "middle",
                 camZBottom: 0,
                 camZClearance: 1,