Promote: staging -> develop#717
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fix(home): catch recovery-gate failure + pin error surface in a test
## Summary
Fixes the post-account-merge "Wallet registration not complete" error
(red banner) in the RealUnit app, the CONTRIBUTING-aligned way.
When a new wallet signs up with an email that already belongs to an
existing **DFX** account (account merge) and that account has **no prior
RealUnit registration**, `GET /v1/realunit/registration` returns
`state=NewRegistration`. The email-verification step, however, called
`registerWallet` (`POST /register/wallet`) **unconditionally** — that
endpoint only *adds* a wallet to an **existing** registration, so the
API returns `400 "No RealUnit registration found"`.
## Root cause — runtime-confirmed (PROD App Insights)
- `GET /v1/realunit/registration` → **200** (state=NewRegistration,
userData present from existing KYC)
- `POST /v1/realunit/register/wallet` → **400 `{"message":"No RealUnit
registration found"}`** (×4 retries)
- recovery: the user reached the KYC registration form → `POST
/v1/realunit/register/complete` → **201**
- DB: the merged account had no `RealUnitRegistration` step until
`register/complete` created it. 7-day breadth: 7× this 400 (affects
every merge into a DFX account without a prior RealUnit registration).
## Fix (app-only) — single source of registration routing
The email-verification flow is reduced to its actual job: **confirm the
merge** (detect the JWT account change) and hand back to the KYC flow.
`KycCubit` is now the only place that interprets the registration
`state` and routes it (addWallet → link wallet, NewRegistration → full
registration form, AlreadyRegistered → forward) — per CONTRIBUTING.md
"API as Decision Authority". This removes the duplicated, unconditional
`register/wallet` call.
Dead code removed accordingly: `_completeRegistration`,
`_mergeDetected`, the `RealUnitRegistrationService` dependency, the
`KycEmailVerificationRegistrationFailure` state, and the now-unused i18n
key `registerEmailVerificationRegistrationFailed` (de + en).
## Tests
- email cubit (simplified): same account → Failure (link not visited);
changed account → Success (merge confirmed; no registration here); retry
(Failure → Success).
- `kyc_step_states_test` updated for the removed state.
## Test plan
- [x] `flutter analyze` clean
- [x] `flutter test --exclude-tags golden` — full suite passes (2312)
- [x] Coverage Floor Gate replicated locally — scoped **lines 100.0%**
(floor 100)
- [ ] DEV end-to-end: merge into a DFX account without RealUnit
registration → no red error → lands on the registration form →
register/complete
Supersedes #711 (minimal variant) and the earlier incorrect
MergeProcessing PRs DFXswiss/api#3848 + #709.
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