feat(tui): add static busy indicator option for accessibility

[justinlevinedotme]

Summary

• Added a configurable [currently busy] static text indicator as an alternative to the animated spinner
• This helps neurodivergent users who find motion distracting to maintain focus while interacting with the terminal
• Fixed a type error where theme.blue was accessed instead of theme.info

Fixes #10244

[github-actions]

Hey! Your PR title tui: add static busy indicator option for accessibility doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found

[justinlevinedotme]

Looks like we already have a "disable animations" toggle. Will close this an update it to deal with the busy indicator