仪表盘侧边栏

Create a collapsible dashboard sidebar. Expanded state shows icons + labels; collapsed state shows only icons. Include 8 navigation items grouped into sections (Main, Analytics, Settings), a collapse toggle at the bottom, and a user avatar at the top. Use shadcn/ui Tooltip for collapsed icons and Tailwind CSS. Persist collapsed state in localStorage and make it responsive.

创建一个可折叠的仪表盘侧边栏。展开状态显示图标+标签；折叠状态只显示图标。包含 8 个按分组排列的导航项（Main、Analytics、Settings），底部折叠切换按钮，顶部用户头像。使用 shadcn/ui Tooltip 显示折叠状态下的图标标签，以及 Tailwind CSS。将折叠状态持久化到 localStorage 并使其响应式。