docs(guide): rewrite CLAUDE.md with ZCLAW-first perspective

Major changes:
- Shift from "OpenFang desktop client" to "independent AI Agent desktop app"
- Add decision principle: "Is this useful for ZCLAW? Does it affect ZCLAW?"
- Simplify project structure and tech stack sections
- Replace OpenClaw vs OpenFang comparison with unified backend approach
- Consolidate troubleshooting from scattered sections into organized FAQ
- Update Hands system documentation with 8 capabilities and status
- Stream

desktop/src/components/ui/EmptyState.tsx

@@ -10,7 +10,7 @@ interface EmptyStateProps {
 
 export function EmptyState({ icon, title, description, action, className }: EmptyStateProps) {
   return (
-    <div className={cn('flex-1 flex items-center justify-center p-6', className)}>
+    <div className={cn('h-full flex items-center justify-center p-6', className)}>
       <div className="text-center max-w-sm">
         <div className="w-16 h-16 bg-gray-100 dark:bg-gray-800 rounded-full flex items-center justify-center mx-auto mb-4 text-gray-400">
           {icon}