feat: Sentinel 卡片数据刷新动画

- 卡片更新时背景闪烁 (card-flash keyframe)
- 进度条平滑过渡 (cubic-bezier .6s)
- 数值涨跌颜色: 绿涨↑ 红跌↓ 不变灰色
- 渐变进度条背景
- 存储前值用于趋势对比

Co-Authored-By: Claude <noreply@anthropic.com>

config/permissions/pending_requests.json

@@ -174,5 +174,27 @@
       "framework.command.execute"
     ],
     "timestamp": 26605.866739485
+  },
+  "8e60727b": {
+    "plugin_name": "example_plugin",
+    "permissions": [
+      "plugin.example.read",
+      "plugin.example.write",
+      "plugin.example.execute",
+      "framework.event.subscribe",
+      "framework.command.execute"
+    ],
+    "timestamp": 26822.1525256
+  },
+  "25a21431": {
+    "plugin_name": "sentinel",
+    "permissions": [
+      "plugin.sentinel.read",
+      "plugin.sentinel.write",
+      "plugin.network.access",
+      "framework.event.subscribe",
+      "framework.command.execute"
+    ],
+    "timestamp": 26822.157063829
   }
 }