fix: standardize MCP panel button font sizes to match app-wide consistency

Remove size="sm" from MCP panel buttons to use default text-sm instead of text-xs, ensuring visual consistency with buttons throughout the application.

src/components/mcp/McpFormModal.tsx

@@ -654,12 +654,11 @@ const McpFormModal: React.FC<McpFormModalProps> = ({
 
             {/* 操作按钮 */}
             <div className="flex items-center gap-3">
-              <Button type="button" variant="ghost" size="sm" onClick={onClose}>
+              <Button type="button" variant="ghost" onClick={onClose}>
                 {t("common.cancel")}
               </Button>
               <Button
                 type="button"
-                size="sm"
                 onClick={handleSubmit}
                 disabled={saving || (!isEditing && !!idError)}
                 variant="mcp"

src/components/mcp/McpPanel.tsx

@@ -123,7 +123,7 @@ const McpPanel: React.FC<McpPanelProps> = ({ open, onOpenChange, appType }) => {
           <DialogHeader>
             <div className="flex items-center justify-between pr-8">
               <DialogTitle>{panelTitle}</DialogTitle>
-              <Button type="button" variant="mcp" size="sm" onClick={handleAdd}>
+              <Button type="button" variant="mcp" onClick={handleAdd}>
                 <Plus size={16} />
                 {t("mcp.add")}
               </Button>
@@ -191,7 +191,6 @@ const McpPanel: React.FC<McpPanelProps> = ({ open, onOpenChange, appType }) => {
             <Button
               type="button"
               variant="mcp"
-              size="sm"
               onClick={() => onOpenChange(false)}
             >
               <Check size={16} />