1.1.0

1.1.0: computer use, pull requests, and the 5-hour limit strip

- Computer use: with the setting on, the agent can use the mouse, the
  keyboard and other apps; a bar shows the last action, and a summary goes
  under the answer.
- Pull requests through the GitHub CLI.
- A strip above the composer when the 5-hour limit on Unlimited models moved
  a run to another model: what answered, what paid for it, and a countdown to
  when Unlimited models are back.