fix the ink version

[michaelneale]

needs a new version and react, so that it is actually usable in iterm2

edit: #8004 may be better of the 2 as it uses stdio (on top of this) FWY

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Declare Ink 6's new Node 20 requirement

Upgrading ink here silently raises the TUI's runtime floor from Node 18 to Node 20: the updated workspace lockfile resolves ink@6.8.0 with engines.node: >=20, whereas the previous ink@5.x worked on Node 18, and neither ui/text/package.json nor the install docs (ui/text/README.md, documentation/docs/guides/acp-clients.md) advertise a stricter engine. Users on Node 18/19 who could previously run cd ui/text && npm install && npm start will now end up with an unsupported dependency tree, so we should either keep Ink 5 or explicitly enforce/document the new Node requirement alongside this version bump.

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