Cover text fields, numeric fields, +/- adjuster buttons, searchable
selects, image upload/replace/remove, deferred image save, and the
cancel button across roaster, gear, cafe, brew, and cup entities.
Add wait_for_url_not_contains helper to correctly detect post-submit
redirects when the edit page URL shares a prefix with the detail page.
BrowserSession wraps headless Chrome via thirtyfour. Auth helper injects
session cookies to bypass WebAuthn. Wait helpers handle Datastar's async
DOM updates (visibility, text, URL). Form helpers find visible elements
to avoid hidden duplicates on tabbed pages. Chromedriver is auto-spawned
on first use via a dedicated parked thread with PR_SET_PDEATHSIG so the
kernel kills it when the test binary exits.
