Persist-first client reads: previews carry persisted ids, refreshes wait for the in-flight persist

[ThbPS]

Questions	Answers
Description?	Minimal client-side fix: the guest inline flow kept sending raw address fields even once the autosave had persisted them, making the server mount-and-delete temp address rows on routine rounds (row churn, mid-flight pricing against unconfirmed state). The client now resolves the persisted state first — previews carry the persisted ids when the form is clean, and refreshes wait for the in-flight persist. The server takes its battle-tested id-branch; no server change — the temp branches simply become cold fallbacks. Stacked on #121.
Type?	bug fix
BC breaks?	one deliberate contract change: a still-valid carrier selection now survives an address round-trip (re-validated server-side) instead of being cookie-cleared
Deprecations?	no
Fixed ticket?	Follow-up of #121 (same nightly race family: routine temp churn / mid-persist pricing).
How to test?	Red-first specs below; full lot green; CI dispatch.

The three fixes (one commit, +111/−7, client only)

1. Previews carry the persisted ids when the form is clean — buildSelectAddressPayload resolves the autosave-persisted hidden id unless an edit is pending (opcDraftPending dataset dirty-flag, set on input, cleared per address type by the persist response; a use_same=1 save only MIRRORS the delivery id onto the invoice pointer and must not lift the billing hold).
2. Previews triggered on a dirty form are held and re-run on opcAddressPersisted. Inconclusive autosaves (incomplete address mid-typing) keep the hold armed — the eventual successful persist re-runs the refresh; section readiness owns the retract meanwhile.
3. A carriers fetch racing the FIRST persist (core updatedCart, retry click) holds the loader and re-fetches with the persisted id once the autosave confirms — same inconclusive-keeps-the-defer rule.

TDD evidence

Red-first e2e specs (PrestaShopCorp/opc.e2e.tests branch test/persist-first-address-reads, not in CI lots — same convention as local-race-repro):

• C1 red: toggle previews left with id_address_delivery=0 instead of the persisted id → green.
• C2 red: no carriers response carrying the persisted id ever follows a fetch racing the first persist → green.
• C3 red: previews left with raw billing fields while an edit was unpersisted (2 payloads) → green. The mirror-save trap and the inconclusive-drop starvation were both caught by the loop-validation and fixed within the cycle.

Validation: full opc-payment-eligibility lot green locally; A/B baseline confirmed the residual ~1/6 local flake on two billing specs pre-exists on #121's content (not introduced here).

The one observable contract change (deliberate)

Routing the carrier click through the id-branch moves the selection onto the CART
(instead of the temp-keyed cookie): it is re-validated against every address round —
dropped when unavailable (unchanged protection, still asserted by the no-carrier leg
of spe42) and restored when still valid (was: silently lost). spe42's cookie-clear
pin is migrated accordingly on the paired e2e branch.

Merge pairing: merge together with PrestaShopCorp/opc.e2e.tests branch
test/persist-first-address-reads (C1-C3 specs + the spe42 contract migration).

Deliberately out of scope

The temp-address machinery itself (OpcTempAddress, the two cookie storages, the guard mount) stays untouched as the fallback for third-party raw-fields integrations and degraded windows. Its retirement is a separate refactor PR once this has soaked — the full TDD'd retirement (server awaiting contracts + deletions, −651 lines) is already prepared and validated (10/11 lots CI, the single red being a cookie-contract e2e pin) if/when wanted.

🤖 Generated with Claude Code

[ThbPS]

Consolidated into #121 per review decision: one train so everything is tested together. The final diff leaves OpcTempAddress strictly untouched (the persist-first client makes the temp branches cold; the per-cart lock serializes the OPC-vs-OPC interleavings). The full temp-machinery retirement stays a future refactor PR — already TDD-validated 11/11 in CI (run 29418233325), parked on wip/temp-retirement-full.