This PR adds support for a new feature flag `tui.animations`. By default, the TUI uses animations in its welcome screen, "working" spinners, and "shimmer" effects. This animations can interfere with screen readers, so it's good to provide a way to disable them. This change is inspired by [a PR](https://github.com/openai/codex/pull/4014) contributed by @Orinks. That PR has faltered a bit, but I think the core idea is sound. This version incorporates feedback from @aibrahim-oai. In particular: 1. It uses a feature flag (`tui.animations`) rather than the unqualified CLI key `no-animations`. Feature flags are the preferred way to expose boolean switches. They are also exposed via CLI command switches. 2. It includes more complete documentation. 3. It disables a few animations that the other PR omitted. |
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