* feat(ui): add a Create PR branch row with rate-limit staleness to session PR chips
* fix(ui): gate the Create PR row on a pushed branch
* improve(ui): gate the Create PR row on comparable pushed commits and count untracked work
* fix(ui): satisfy spread lint and align branch-row test fixtures
* chore(ui): translate Create PR branch row copy
* chore(ui): drop zh-CN retranslation churn from the aborted backfill
* fix(ui): guard branch diff stats against checkout diff drivers and fail closed without a default branch