[TASK] e2e - invoicing suite: inFakt provider, payment marking, corrections (KOR), FA(3) field + preview parity

[norbert-kulus-blockydevs]

Problem / Context

S8 covers a single invoicing configuration: KSeF direct, one VAT document, happy path. Recently merged and untested at the E2E level:

• inFakt provider path: shipping line on the invoice + label wiring + webhook (feat(invoicing): inFakt epic - invoice shipping line + label wiring + webhook integration test #1567), outbound PaymentMarker (feat(invoicing): outbound mark-as-paid (PaymentMarker) for inFakt #1475), plus the UX batch (bulk issue, resend-to-KSeF, e-mail - [FEATURE] Integration/Frontend — Infakt: send invoice to buyer by email (one click, no inFakt dashboard) #1353-[FEATURE] Integration/Frontend — Infakt: 'Resend to KSeF' action for rejected invoices (adapter method exists) #1356).
• Corrections: CorrectionIssuer KOR path (Wire CorrectionIssuer capability onto KsefInvoicingAdapter #1288) with the issuance-time line snapshot semantics ([TECH-DEBT] CORE — Persist issuance-time line snapshot on InvoiceRecord for safe KSeF corrections #1297).
• FA(3) fidelity: P_6 / P_8A / P_9A emission (feat(ksef): emit P_6 / P_8A / P_9A in FA(3) documents #1529) and the rebuilt FA(3) preview (feat(web/ksef): rebuild FA(3) preview to mirror the official KSeF visualization #1528).
• Transfer payments: bank-account picker backed by BankAccountsReader / BankAccountDefaultSetter ([TECH-DEBT] Integration — Infakt payment_method hardcoded and inconsistent between issueInvoice/issueCorrection #1303 follow-up).

Proposed Solution

New suite apps/e2e/tests/invoicing/ (unattended - source orders synthesized via a REST source, KSeF test env + inFakt sandbox as external systems). Scenarios:

1. inFakt provider run: issue -> submitted -> accepted via inFakt (observed E2E latency ~90 s); the invoice carries the shipping line and totals match the order (reuse assertInvoiceAmounts).
2. Payment marking, both directions: mark-as-paid in OL propagates to inFakt (PaymentMarker); the inFakt marked-as-paid webhook updates OL.
3. Bulk issue + resend + e-mail: bulk issuance from the orders list; resend a rejected document; e-mail send affordance.
4. Correction (KOR): issue a correction (quantity/price delta) on a KSeF invoice -> accepted; then a correction-of-correction - asserting deltas are computed against the lines as issued (issuedLineSnapshot, [TECH-DEBT] CORE — Persist issuance-time line snapshot on InvoiceRecord for safe KSeF corrections #1297), not the order's current state.
5. FA(3) field parity (feat(ksef): emit P_6 / P_8A / P_9A in FA(3) documents #1529): source XML contains correct P_6 / P_8A / P_9A (extend the existing S8 source-XML assertions).
6. FA(3) preview (feat(web/ksef): rebuild FA(3) preview to mirror the official KSeF visualization #1528): the preview renders the invoice's sections/amounts structurally (DOM-level, not pixel).
7. Transfer + bank accounts: issuing a Transfer invoice offers the live account picker; setting a default persists on the provider.

Classification

Type: DX
Layer: Test infrastructure (apps/e2e)
File(s): apps/e2e/tests/invoicing/*.spec.ts, apps/e2e/src/pages/invoice-panel.page.ts, apps/e2e/src/support/parity.ts, apps/e2e/src/api/api-client.ts

Dependencies

• Parent epic; base branch 1479-apps-e2e-playwright-framework (PR feat(e2e): apps/e2e Playwright framework + golden paths S1-S4 (unattended) and S0-S9 (attended, all 6 systems) #1480).
• inFakt sandbox credentials + KSeF test environment (both already used in manual E2E runs).

Assumptions

• Scenario 2's inbound webhook needs the OL API reachable from inFakt (tunnel) - env-gated if the stack cannot expose it.
• The reconcile job can be triggered explicitly via the sync-jobs API (as the golden path already does) instead of waiting for the 30-min cron.
• If any listed FE affordance turns out not to exist yet (e.g. e-mail send), the scenario is dropped from this issue and filed as a product gap instead.

Acceptance Criteria

• Scenarios 1-7 implemented and passing (webhook scenario env-gated if tunnel-dependent)
• Correction-of-correction asserts snapshot-based deltas explicitly
• Suite is unattended and runs as its own Playwright project
• PR merges into 1479-apps-e2e-playwright-framework

Part of epic #1570.