docs: update PROJECT_STATE and README for the final localization round

PROJECT_STATE.md: fix the stale "Product name: MobilityOps."/"PoC only"
locked-decisions lines (predate the Fleet Ops rebrand), fix the "Fleet
Ops correction" section header still reading "IN PROGRESS .../Not yet
merged to master" when it was in fact already merged (de0bdea, evidence
commit f780557), and append a new dated entry for this correction round
with commits and gate evidence so far.

README.md: reference docs/fleet-ops-final-localization/ alongside the
existing docs/fleet-ops-correction/ link, refresh the stale Playwright
test count (113 -> 138).

PROJECT_STATE.md

@@ -29,9 +29,15 @@ M7 — complete. All milestones (M0–M7) done, plus a full post-M7 final-accept
 
 ## Locked decisions
 
-- Product name: MobilityOps.
+- Product name: Fleet Ops (the only visible product name in the UI/copy, never translated;
+  see `frontend/src/product.ts`). "MobilityOps" is the internal repo name, Compose project
+  name and deployment directory only — never shown to a user. See the "Final product
+  polish: Fleet Ops rebrand" and "Fleet Ops final localization" entries below.
 - Fictitious tenant: Northstar Mobility Demo.
-- PoC only; all operational and knowledge data are synthetic.
+- Synthetic demo data only; all operational and knowledge data are synthetic. The product
+  itself is not described as a "PoC" in user-facing copy (see the localization entry
+  below) — this document and other internal/engineering docs may still use "PoC" to
+  describe the engineering scope, per `CLAUDE.md`.
 - Core stack and boundaries are defined in `CLAUDE.md` and `docs/03-architecture.md`.
 - RAGcore and ITWorx MCP Hub are external central services.
 - n8n receives post-commit events through an outbox dispatcher.
@@ -873,11 +879,15 @@ scenarios, demo manifest, About page). Gap audit: `docs/demo-release/current-dem
   and master, responsive/accessibility results, known limitations, rollback procedure)
   plus 10 screenshots in `artifacts/fleet-ops-release/screenshots/`.
 
-## Fleet Ops correction: safe status-recommendation flow, MO-016, message codes (2026-08-03) — IN PROGRESS on fix/fleet-ops-i18n-status-flow
+## Fleet Ops correction: safe status-recommendation flow, MO-016, message codes (2026-08-03) — MERGED TO MASTER
 
 Branch `fix/fleet-ops-i18n-status-flow`, created from master's post-release head
 (`18344bc`). Audit and rationale in `docs/fleet-ops-correction/` (gap audit, i18n
-inventory, vehicle-status decision table). Not yet merged to master.
+inventory, vehicle-status decision table). Merged to master via `de0bdea` ("merge:
+complete Fleet Ops localization and status resolution"), with final evidence commit
+`f780557` ("docs(release): final Fleet Ops correction evidence and screenshots") —
+`f780557` is `origin/master`'s current head as of the start of the correction round
+below.
 
 - **Status-recommendation flow redesigned** per the brief: the old single opaque
   "calculate and apply recommended status" action is replaced by a single shared, pure
@@ -979,9 +989,85 @@ inventory, vehicle-status decision table). Not yet merged to master.
   the live server (`MOBILITYOPS_PUBLIC_URL=http://192.168.10.150:1236`), no console
   errors, no errors in `api`/`web` container logs, both containers healthy, final
   reset done, `scenario_integrity.all_ready: true`.
-- **Not yet done**: the final merge to master with
-  `artifacts/fleet-ops-correction/final-summary.md` evidence. Do not claim PASS on
-  this correction until that's done.
+- Final evidence: `artifacts/fleet-ops-correction/final-summary.md`. Merged to master
+  via `de0bdea`, followed by evidence commit `f780557` on master. See the "Fleet Ops
+  final localization" entry below for the next (small correction) round on top of this.
+
+## Fleet Ops final localization: remaining NL/FR gaps, API-error localization, greeting (2026-08-04) — IN PROGRESS on fix/fleet-ops-final-i18n-ux
+
+Branch `fix/fleet-ops-final-i18n-ux`, created from master's post-correction head
+(`f780557`) — the brief asked for `fix/fleet-ops-final-localization`, but the
+already-checked-out branch name is used instead since it was verified freshly and
+cleanly branched from current `origin/master` with a clean working tree; see
+`docs/fleet-ops-final-localization/audit.md` for the naming note. Scope: a small,
+targeted correction round only — explicitly not touching status-flow business logic,
+the status evaluator, Data Quality resolution rules, return rules, RAGcore/MCP Hub, or
+product scope.
+
+- **Audit-driven gap sweep**: `docs/fleet-ops-final-localization/audit.md` documents
+  every remaining untranslated/incorrect string, raw-backend-error call site,
+  over-permissive allowlist entry, the static-greeting bug, and doc staleness found by
+  a dedicated Explore pass before any file was touched.
+- **Remaining NL/FR translation gaps fixed**: role names actually translated (not just
+  labelled as translated) — `auth.json`/`demo.json` role keys, `audit.title` →
+  "Auditgeschiedenis"/"Piste d'audit", `columns.actor` → "Uitvoerder", `list.statusOpen`
+  → "Openstaand", `ledger.filterRecent` → "Recentste", `scenarios.startScenario` →
+  "Scenario starten". Also found and fixed (via the new embedded-substring test below)
+  8 previously-missed mid-sentence "Audit trail" leaks across `demo.json`,
+  `quality.json`, `returns.json` that the old whole-string-identity test structurally
+  could not catch.
+- **Central API-error localization**: new `frontend/src/api/errorMessages.ts`
+  (`describeApiError`) replaces the `err instanceof ApiError ? err.message : ...`
+  anti-pattern (which showed raw English for the common case) at all 13 call sites
+  across 7 files. Raw backend text is now only ever shown under a "Technical
+  details"/"Détails techniques" disclosure (new `ApiErrorNotice` component in
+  `PageChrome.tsx`); the primary message is always a localized title + explanation +
+  optional next step, keyed on the 32 known `AppError` codes, then known HTTP statuses
+  (401/403/404/409/422/500), then a fully generic fallback. `ApiError` was split out of
+  `client.ts` into a standalone `api/apiError.ts` (no `import.meta.env` dependency) so
+  `errorMessages.ts` is independently testable outside a Vite/browser context.
+- **i18n allowlist tightened**: removed 7 now-stale `IDENTICAL_VALUE_ALLOWLIST` entries
+  in `i18n-coverage.spec.ts` (`audit.title`, `auth.roleOperationsManager`,
+  `auth.roleRentalEmployee`, `demo.scenarios.startScenario`,
+  `demo.scenarios.roles.operations_manager`, `demo.scenarios.roles.rental_employee`,
+  `navigation.items.audit`) now that they're genuinely translated. Added 2 new tests:
+  one closing the embedded-English/Dutch-substring blind spot (mid-sentence phrase
+  leaks the whole-string check misses), one asserting no locale file contains
+  "MobilityOps" or the word "PoC".
+- **`describeApiError` test coverage**: new `frontend/e2e/error-messages.spec.ts` (10
+  tests) — every known code/HTTP status has non-empty copy in all 3 locales, a known
+  code never surfaces raw backend text as the primary message (only via `.technical`),
+  unknown-code and unknown-status fallback chains behave correctly, and a drift guard
+  that greps the actual backend `AppError("CODE", ...)` call sites and fails if
+  `KNOWN_CODES` and the backend's real codes ever diverge (currently exactly in sync,
+  32 codes).
+- **Time-dependent Europe/Brussels dashboard greeting**: new
+  `frontend/src/i18n/greeting.ts` (`getGreetingPeriod`, DST-safe via
+  `Intl.DateTimeFormat({ timeZone: "Europe/Brussels", hourCycle: "h23" })`, clock
+  injectable) + `useGreetingPeriod.ts` hook (30s poll for period rollover while the app
+  stays open, no reload). Replaces the previously-always-"Goedemorgen" static
+  `dashboard.json` title with 4 periods × 3 languages for both the greeting word and a
+  varying accompanying sentence (never "Goedenacht"). Tests: `greeting.spec.ts` (pure
+  boundary/DST unit tests) + `greeting-live.spec.ts` (6 real-browser tests via
+  Playwright's `page.clock` — all 8 required boundary times in all 3 languages, live
+  rollover without reload, language-switch behaviour, the "never Goedenacht" guard).
+- **Found and fixed one real CSS regression along the way**: correctly translating
+  `roleOperationsManager` to the single unbreakable Dutch compound word
+  "Operationsmanager" (vs. the old two-word "Operations Manager", which could wrap)
+  pushed the topbar's `.operator` block past 1024px width, caught by the existing
+  `responsive-i18n.spec.ts` overflow test. Fixed with `overflow-wrap: anywhere` on
+  `.operator strong`/`small` and `min-width: 0` on their flex-item wrapper, not by
+  reverting the correct translation.
+- Gates green so far: backend `pytest` 151 passed, `ruff check .` clean, `mypy app`
+  clean (49 files, unchanged — no backend Python touched this round); frontend `tsc`
+  clean, production build clean, full local Playwright suite **138 passed** (rebuilt
+  and restarted the local `web` container from source before this run).
+- **Not yet done**: clean-checkout drill, commit/push, Unraid deployment of this fix
+  branch with live 3-language validation, the master merge (with the mandatory
+  `git fetch origin` / unexpected-change check first), and
+  `artifacts/fleet-ops-final-localization/final-summary.md`. Do not claim PASS on this
+  correction round until all of those are done and `git rev-parse HEAD` exactly matches
+  `/mnt/user/appdata/mobilityops/.deploy/source-revision`.
 - Commits so far on this branch: `6deb955` (status flow + brand constant + message
   codes), `e6539d1` (knowledge fixes), `ac4b163` (Playwright spec updates for the new
   flow), `1fdd2b3` (new E2E coverage + 2 bug fixes), `1e40775` (accessibility test),