fix: update all renamed Lucide icons and make icon test dynamic (#150)

- FileEdit -> FilePen (bulk-rename tool)
- Wand2 -> Wand (object eraser)
- Columns -> Columns2 (stitch tool)
- Add Expand to ICON_MAP (ai-canvas-expand)
- Make icon-map test derive icon lists from shared constants instead
  of hardcoding names, preventing future breakage on icon renames

packages/shared/src/constants.ts

@@ -84,7 +84,7 @@ export const TOOLS: Tool[] = [
     name: "Bulk Rename",
     description: "Rename multiple files with patterns",
     category: "optimization",
-    icon: "FileEdit",
+    icon: "FilePen",
     route: "/bulk-rename",
   },
   {