v2.0.0 — Multi-account, reviewer dashboard, push-since-approval.

Highlights:
- Multi-account support — add multiple GitHub accounts to one install and switch from the popup
header.
- Reviewer dashboard tab — PRs where you're a requested reviewer or assignee, with state chips and
optional conservative auto-merge per allowlisted repo.
- Push-since-approval badge — PRs that received new commits after your last approval surface a
"re-review" chip.
- Settings split — global (shared across accounts) vs per-account.
- Header repo-filter chip — narrow the popup PR list to a subset of repos.
- Desktop notifications (opt-in) — per-event toggles for rebased / conflicted / merged / idle /
ping-confirmed.
- Stale-PR badge with one-click reviewer @-mention.

Full changelog: https://github.com/bradygrapentine/auto-rebaser/releases/tag/v2.0.0