feat: enhance studio app with left panel toggle and loading state

- Added a left panel toggle button in the header to show/hide the ViewList component.
- Integrated loading state management in the studio store for better user feedback during data fetching.
- Updated the ViewList component to utilize a dropdown menu for editing and deleting views.
- Improved UI elements with consistent border styles and loading indicators.
- Refactored the DataItemForm and ViewFormItem components for better user experience and added clipboard copy functionality.
- Introduced a new DropdownMenu component for better dropdown handling across the application.

web/src/apps/view/components/DataItemForm.tsx

@@ -95,7 +95,7 @@ export const DataItemForm = ({ item, onChange, onRemove }: DataItemFormProps) =>
   }
 
   return (
-    <div className="border rounded-lg p-4 mb-4 space-y-4">
+    <div className="border border-gray-300 rounded-lg p-4 mb-4 space-y-4">
       <div className="flex justify-between items-center">
         <h3 className="font-medium">数据项配置</h3>
         <button