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/geo/polygons.js

@@ -41,36 +41,36 @@ const CleanPolygon = Clipper.CleanPolygon,
     ClipIntersect = ClipType.ctIntersection;
 
 const POLYS = {
-    clearInner,
-    rayIntersect,
     alignWindings,
-    setWinding,
-    fillArea,
-    subtract,
-    flatten,
-    offset,
-    trimTo,
-    expand,
-    points,
-    length,
-    renest,
-    route,
-    union,
-    inset,
-    outer,
-    inner,
-    nest,
+    cleanClipperTree,
+    clearInner,
     diff,
-    xor,
-    setZ,
+    expand,
+    fillArea,
     filter,
-    toClipper,
+    fingerprint,
+    fingerprintCompare,
+    flatten,
     fromClipperNode,
     fromClipperTree,
     fromClipperTreeUnion,
-    cleanClipperTree,
-    fingerprintCompare,
-    fingerprint
+    inner,
+    inset,
+    length,
+    nest,
+    offset,
+    outer,
+    points,
+    rayIntersect,
+    renest,
+    route,
+    setWinding,
+    setZ,
+    subtract,
+    toClipper,
+    trimTo,
+    union,
+    xor,
 };
 
 export { POLYS };