fix: resolve 4 bugs in termui - #3678

Process completed with exit code 2.

examples-weather#typecheck: command (/home/runner/work/TermUI/TermUI/examples/weather) /home/runner/.bun/bin/bun run typecheck exited (2)

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. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/