Revert "feat: replace AI matting with chroma-based checkerboard detection"

This reverts commit f1a4c94375.

packages/shared/src/constants.ts

@@ -250,18 +250,18 @@ export const TOOLS: Tool[] = [
     route: "/content-aware-resize",
   },
   {
-    id: "ai-canvas-expand",
-    name: "AI Canvas Expand",
-    description: "Expand canvas beyond image bounds with AI-powered fill",
+    id: "content-aware-crop",
+    name: "Content-Aware Crop",
+    description: "Extend canvas beyond image bounds with AI-powered fill",
     category: "ai",
     icon: "Expand",
-    route: "/ai-canvas-expand",
+    route: "/content-aware-crop",
   },
   {
     id: "transparency-fixer",
     name: "PNG Transparency Fixer",
     description: "Fix fake transparent PNGs in one click",
-    category: "utilities",
+    category: "ai",
     icon: "ShieldCheck",
     route: "/transparency-fixer",
   },
@@ -1247,5 +1247,6 @@ export const PYTHON_SIDECAR_TOOLS = [
   "red-eye-removal",
   "restore-photo",
   "passport-photo",
-  "ai-canvas-expand",
+  "transparency-fixer",
+  "content-aware-crop",
 ] as const;