Samsung rebuilt account.samsung.com as a JS SPA backed by /iam/oauth2,
so the integration's HTML-scraping QR flow can no longer find the
signin URL and /accounts/v1/FMM2/signInWithQrCode now 404s. The STF
backend (chkLogin.do, getDeviceList.do, ...) is unchanged.
Replace the multi-step QR config flow with a single form that asks
the user to paste the JSESSIONID cookie copied from a logged-in
browser session at smartthingsfind.samsung.com. validate_jsessionid
hits chkLogin.do to verify the cookie before accepting it.
Also bundle in earlier compatibility fixes for newer HA: store
devices in hass.data so the coordinator can look them up by
entry_id, and use async_on_update on the device_tracker entity.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
