fix(e2e): let each captured flow file under its own category

[haribo]

Summary

• judging a capture filed under account on production: push.ts hardcoded the category (let each captured flow file under its own category #245 — the YAGNI deferral recorded on capture the dead sign-in link as evidence #241 met its counter-example one flow later)
• The category is now named by each flow: account for the sign-in family, review for the carousel; caseFor keeps finding existing cases by title and never re-categorises them
• The production case was moved into a review root category by hand (PATCH /cases/{id}), verified

Test plan

• Suite with OZALID_PUSH_SELF=1: 66 passed — the carousel case files under review on a fresh instance
• fe-check

Evidence tooling only, no release needed.

Closes #245