feat: add BETA badge to chat panel header

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/ChatPanel.tsx

@@ -145,7 +145,7 @@ export function ChatPanel({ isOpen, onClose, onBuildWorkflow, isBuildingWorkflow
     <div className="fixed top-16 bottom-[220px] right-5 w-[380px] bg-neutral-800 border border-neutral-700 rounded-lg shadow-xl flex flex-col overflow-hidden z-40">
       {/* Header */}
       <div className="flex items-center justify-between px-4 py-3 border-b border-neutral-700">
-        <h3 className="text-sm font-medium text-neutral-200">Workflow Assistant</h3>
+        <h3 className="text-sm font-medium text-neutral-200">Workflow Assistant <span className="ml-1.5 text-[10px] font-semibold uppercase tracking-wider bg-yellow-500/20 text-yellow-400 border border-yellow-500/30 rounded px-1.5 py-0.5">Beta</span></h3>
         <div className="flex items-center gap-1">
           {messages.length > 0 && (
             <button