fix: skill injected into system prompt

frontend/src/components/ChatInterface.tsx

@@ -264,7 +264,7 @@ export function ChatInterface() {
           const formattedMessages = data.messages
             .filter((m) => {
               if (m.role === 'system' || m.role === 'tool' || m.role === 'function') return false;
-              if (m.role === 'assistant' && m.tool_calls && m.tool_calls.length > 0 && !m.viz) return false;
+              if (m.role === 'assistant' && m.tool_calls && m.tool_calls.length > 0 && !m.viz && (!m.content || m.content.trim() === '')) return false;
               return true;
             })
             .map((m, idx) => ({

frontend/src/pages/Skills.tsx

@@ -227,7 +227,7 @@ export function Skills() {
                         </div>
                       </TableCell>
                       <TableCell className="py-4 px-4 text-right">
-                        <div className="flex justify-end gap-1">
+                        <div className="flex items-center justify-end gap-1">
                           <Button 
                             variant="ghost" 
                             size="icon"