fix: 进度条平滑过渡 — force reflow 技巧确保 CSS transition 生效

- 临时关 transition → 设旧值 → offsetWidth reflow → 开 transition → 设新值
- DOM 复用: 首次 innerHTML 创建, 后续只改属性
- 进度条从旧值滑到新值, 不再闪现

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

config/permissions/pending_requests.json

@@ -262,5 +262,27 @@
       "framework.command.execute"
     ],
     "timestamp": 27544.2709947
+  },
+  "29ffcf99": {
+    "plugin_name": "example_plugin",
+    "permissions": [
+      "plugin.example.read",
+      "plugin.example.write",
+      "plugin.example.execute",
+      "framework.event.subscribe",
+      "framework.command.execute"
+    ],
+    "timestamp": 27821.237625479
+  },
+  "bd46f35e": {
+    "plugin_name": "sentinel",
+    "permissions": [
+      "plugin.sentinel.read",
+      "plugin.sentinel.write",
+      "plugin.network.access",
+      "framework.event.subscribe",
+      "framework.command.execute"
+    ],
+    "timestamp": 27821.239961313
   }
 }