[BUG] Desktop (Linux 2.26454.2): PR bar no longer renders although the PR is bound to the session (regression)

What happens

In the Desktop app's Code tab, the PR bar does not appear for a pull request that the app reports as bound to the session. It used to appear a few days ago, so this looks like a regression.

Environment

• Claude Desktop 2.26454.2 (Linux beta, Ubuntu-based, installed with apt; apt shows no newer version)
• Claude Code 2.1.293
• Local session in a worktree under <repo>/.claude/worktrees/
• gh is installed and authenticated
• github.com repository (private), with no CI checks configured (no GitHub Actions workflows)

Steps

1. In a local Code-tab session on a worktree branch, open a PR with gh pr create --base main --head <branch>.
2. Look for the PR bar in the session.

Expected

The PR bar shows the bound PR (number, state, CI popover), as it did a few days ago.

Actual

• No PR bar appears.
• The session's own PR tool reports the PR as bound: get_status returns "bound": true with the correct number, URL, state: "open", base and head, and checks: {passing: 0, failing: 0, pending: 0, skipped: 0}.
• Calling bind_pr with the PR URL returns "already bound to this session".
• Pushing more commits to the PR does not make the bar appear.

Possible cause

The repository has no CI checks, so the check counts are all zero. The bar may now be hidden when there are no checks to show, even though the PR itself is bound. If so, a bound PR should still show its bar (PR number, state, link) without checks.

Related, but not the same

• #51575: the PR status indicator is missing for remote-control sessions.
• #63588: the session list's PR chip is greyed out despite the correct backend state.