docs: clarify Node.js runtime support and Bun-only hot reload - #87

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

field `find_pasteboard` is never read

unused variable: `f`

method `hash_into` is never used

associated function `from_gpui` is never used

associated function `from_gpui` is never used

method `is_empty` is never used

function `browser_platform_is_macos` is never used

unnecessary `unsafe` block

field `find_pasteboard` is never read