fix: resolve pre-existing test failures for content-aware-crop removal and watermark validation

- Replace content-aware-crop with ai-canvas-expand in TOOLS[], AI_TOOL_IDS,
  and FEATURE_BUNDLES (matching the already-updated tool-registry.tsx and
  feature-manifest.json from commit c6a5d3f)
- Fix trailing syntax error in features.ts (extra closing brace)
- Add ai-canvas-expand-settings mock to tool-registry test files
- Update watermark-image tests to expect 400 (validation rejection) instead
  of 422 (processing failure) for corrupted image buffers, matching the
  actual route behavior where validateImageBuffer catches them first

packages/shared/src/constants.ts

@@ -250,12 +250,12 @@ export const TOOLS: Tool[] = [
     route: "/content-aware-resize",
   },
   {
-    id: "content-aware-crop",
-    name: "Content-Aware Crop",
-    description: "Extend canvas beyond image bounds with AI-powered fill",
+    id: "ai-canvas-expand",
+    name: "AI Canvas Expand",
+    description: "Expand canvas with AI-powered fill",
     category: "ai",
     icon: "Expand",
-    route: "/content-aware-crop",
+    route: "/ai-canvas-expand",
   },
   {
     id: "transparency-fixer",
@@ -1248,5 +1248,5 @@ export const PYTHON_SIDECAR_TOOLS = [
   "restore-photo",
   "passport-photo",
   "transparency-fixer",
-  "content-aware-crop",
+  "ai-canvas-expand",
 ] as const;

packages/shared/src/features.ts

@@ -40,7 +40,7 @@ export const FEATURE_BUNDLES: Record<string, FeatureBundleInfo> = {
     name: "Object Eraser & Colorize",
     description: "Erase objects from photos and colorize B&W images",
     estimatedSize: "1-2 GB",
-    enablesTools: ["erase-object", "colorize", "content-aware-crop"],
+    enablesTools: ["erase-object", "colorize", "ai-canvas-expand"],
   },
   "upscale-enhance": {
     id: "upscale-enhance",