Add "Dismiss" option to the Create PR branch status widget

Summary

The branch status widget in the Claude Code UI displays a Create PR button whenever the current branch has commits with no associated pull request. There is currently no way to dismiss or suppress this prompt.

Problem

Not every branch warrants a PR. Common scenarios where the nag is unwanted:

• Working in a cloned repo you don't own or intend to push to
• Local-only experimental branches
• Repos where the workflow doesn't use GitHub PRs

Right-clicking the widget offers Create PR, Create Draft PR, and Manually Create PR — but no Dismiss or Not Now option. The only escape is to actually create a PR or tolerate the persistent UI element indefinitely.

Request

Add a Dismiss (or "Don't suggest for this branch") option to the context menu. Ideally it would suppress the nag for that branch for the session, or optionally permanently via a config flag.

Suggested command name

/foi — Eff Off, Immediate (optional, but strongly endorsed)

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Reported by: Robert M. Smith (kg5zsh@gmail.com)