feat(web): trace token shape and texture the whole mesh

TokenViewer now traces the image's alpha channel via /trace and extrudes the silhouette with @tts/mesh, aligning the texture using the full image as the UV framing. The texture is applied to the whole mesh (top, back, and walls) instead of separate solid-white walls.

apps/web/vite.config.ts

@@ -11,6 +11,7 @@ export default defineConfig({
       '/items': 'http://localhost:3000',
       '/health': 'http://localhost:3000',
       '/asset': 'http://localhost:3000',
+      '/trace': 'http://localhost:3000',
     },
   },
 });