v1.2.8

[1.2.8] - 2026-06-01

Added

• In-app update notification. The backend queries the GitHub
  releases API once a day. When a newer PriceStalker release is
  available, logged-in users see a dismissible banner with a link to
  the release notes. Dismissals are per-version (localStorage), so
  a future release re-surfaces it. No telemetry — the only outbound
  request is a single HTTPS GET to api.github.com from the backend
  (never from the user's browser), with User-Agent: PriceStalker/<v>.
  Opt-out entirely with DISABLE_UPDATE_CHECK=true.