Fix demos dark mode - #884

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4, pnpm/action-setup@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

React Hook useCallback has a missing dependency: 'eventHandlers'. Either include it or remove the dependency array

React Hook useCallback has a missing dependency: 'eventHandlers'. Either include it or remove the dependency array

React Hook useMemo has missing dependencies: 'maxChartSize' and 'minChartSize'. Either include them or remove the dependency array

React Hook useMemo has a missing dependency: 'setLabelWidth'. Either include it or remove the dependency array

React Hook useMemo has a missing dependency: 'setLabelWidth'. Either include it or remove the dependency array

React Hook useMemo has a missing dependency: 'setLabelWidth'. Either include it or remove the dependency array

React Hook useEffect has a missing dependency: 'shellStore'. Either include it or remove the dependency array

React Hook useMemo has missing dependencies: 'agentName' and 'logoUrl'. Either include them or remove the dependency array

React Hook useEffect has a missing dependency: 'loadThreads'. Either include it or remove the dependency array