feat(ui-refactor 1/4): token 基座对齐 beautifului.dev foundation 原版——蓝色 accent、ring+分层阴影、圆角体系 6/8/10/14、强缓动曲线、暗色专属 ring；Button 恢复 pill 体系

docs/ui-ref/beautifului/shimmer.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
+  "name": "shimmer",
+  "type": "registry:ui",
+  "title": "Shimmer",
+  "description": "Shared building block used by other Beautiful UI components.",
+  "registryDependencies": [
+    "https://www.beautifului.dev/r/foundation.json"
+  ],
+  "files": [
+    {
+      "path": "components/atoms/Shimmer.tsx",
+      "content": "/** Shimmering label — signals the agent is processing. */\nexport function Shimmer({\n  children,\n  className = \"\",\n}: {\n  children: React.ReactNode;\n  className?: string;\n}) {\n  return (\n    <span\n      className={`inline-block bg-clip-text text-transparent ${className}`}\n      style={{\n        backgroundImage:\n          \"linear-gradient(90deg, var(--ink-3) 35%, var(--ink) 50%, var(--ink-3) 65%)\",\n        backgroundSize: \"200% 100%\",\n        animation: \"shimmer-text 1.8s linear infinite\",\n      }}\n    >\n      {children}\n    </span>\n  );\n}\n",
+      "type": "registry:ui",
+      "target": "components/atoms/Shimmer.tsx"
+    }
+  ]
+}