feat(e2e): capture the dead sign-in link as evidence

[haribo]

Summary

• Second flow of the progressive fill (grow ozalid's own review book, one stable flow at a time #240): the dead sign-in link, turned away — one step, both themes, flow video per variant, pushed as its own case a dead link is turned away
• Chosen for byte-stability (point ozalid at its own screens #107): a fixed amber panel, fixed words, no id on screen — the token stays in the URL; the double-walk check guards it like the sign-in flow
• The closed door was audited out: it renders the sign-in page byte-identically, a duplicate case (correction recorded on capture the dead sign-in link as evidence #241)

Test plan

• Suite with OZALID_PUSH_SELF=1: 65 passed — both capture flows pushed cases, captures and videos, through the real API
• fe-check, fe-test (109)

No product pixels change — evidence tooling only, no release needed.

Closes #241