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/BrowserHand/BrowserHandCard.tsx

@@ -168,7 +168,7 @@ export function BrowserHandCard({ onOpenSettings }: BrowserHandCardProps) {
             className={cn(
               'flex-1 flex items-center justify-center gap-2 px-3 py-2 rounded-lg font-medium transition-colors',
               activeSessionId && !execution.isRunning
-                ? 'bg-blue-600 text-white hover:bg-blue-700'
+                ? 'bg-gray-700 dark:bg-gray-600 text-white hover:bg-gray-800 dark:hover:bg-gray-500'
                 : 'bg-gray-200 text-gray-400 dark:bg-gray-700 dark:text-gray-500 cursor-not-allowed'
             )}
           >