polish: rebrand to Fleet Ops, add trilingual i18n, adaptive demo guide, and UX overhaul

Rebrands the product from MobilityOps to Fleet Ops across the UI, backend defaults and
knowledge base, and makes nl-BE/en-GB/fr-BE full first-class languages: i18next with
eager-bundled per-namespace resources, a persisted accessible language switcher (topbar
and mobile drawer), locale-aware date/number formatting, and a coverage test that fails
the build on any missing or empty translation key.

Backend dynamic content (demo scenarios, blocked-reason text, integration status) moves
from fixed English/Dutch prose to stable message codes + params so the frontend can
localize it; the demo knowledge base gains a fully translated NL/EN/FR procedure corpus
(11 documents each) with per-language retrieval and localized evidence-state messages.

The Demo Guide becomes breakpoint-adaptive: a docked rail on extra-wide desktop, a
floating panel that auto-collapses to a persistent, closable progress chip on standard
desktop/tablet, and a collapsed/half/full bottom sheet on mobile -- with scroll+focus+
highlight on "go to this step", Escape handling, and reduced-motion support.

The Data Quality Workbench gets accessible choice-card decisions with a clear primary/
secondary/tertiary action hierarchy; the Automation ledger groups repeated successes and
uses meaningful short refs; the Audit trail groups events by correlation id with human
action labels and readable before/after diffs. Attention Queue, Today's movements,
Vehicles, Bookings and Data Quality rows are fully clickable (stretched-link pattern)
with independent secondary links, keyboard support and mobile touch targets.

Fixes a topbar overflow on mobile caused by the new language switcher (moved into the
mobile drawer at <=960px) and two dangling aria-labelledby references introduced this
session. Updates all affected Playwright specs for the new nl-BE default and the new
Audit/DemoGuide DOM structure, and adds new i18n-coverage, demo-guide-adaptive and
clickable-rows specs. 131 backend tests, Ruff and mypy, and 71 Playwright tests pass.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/pages/Vehicles.tsx

@@ -1,13 +1,17 @@
 import { useEffect, useState } from "react";
 import { Link } from "react-router-dom";
+import { useTranslation } from "react-i18next";
 import { api } from "../api/client";
 import type { Vehicle } from "../api/types";
+import { useLocaleFormat } from "../i18n/format";
 import { StatusBadge } from "../components/Badge";
 import { EmptyState, ErrorState, LoadingState, PageHeader } from "../components/PageChrome";
 
 const STATUS_OPTIONS = ["available", "rented", "cleaning", "maintenance", "blocked"];
 
 export function Vehicles() {
+  const { t } = useTranslation("fleet");
+  const { formatNumber } = useLocaleFormat();
   const [vehicles, setVehicles] = useState<Vehicle[] | null>(null);
   const [error, setError] = useState<string | null>(null);
   const [status, setStatus] = useState("");
@@ -23,25 +27,25 @@ export function Vehicles() {
     api
       .get<Vehicle[]>(`/api/v1/vehicles?${params.toString()}`)
       .then(setVehicles)
-      .catch(() => setError("Vehicle list is unavailable right now."));
+      .catch(() => setError(t("list.unavailable")));
   }, [status, attentionOnly]);
 
   return (
     <div className="page">
-      <PageHeader eyebrow="Fleet / Registry" title="Vehicle fleet" description="Live operational state, location and service readiness." />
+      <PageHeader eyebrow={t("list.eyebrow")} title={t("list.title")} description={t("list.description")} />
 
-      <form className="filters" aria-label="Filter vehicles">
+      <form className="filters" aria-label={t("list.title")}>
         <label>
-          Search
-          <input type="text" value={query} onChange={(e) => setQuery(e.target.value)} placeholder="Reference, make or location" />
+          {t("list.searchLabel")}
+          <input type="text" value={query} onChange={(e) => setQuery(e.target.value)} placeholder={t("list.searchPlaceholder")} />
         </label>
         <label>
-          Status
+          {t("list.statusLabel")}
           <select value={status} onChange={(e) => setStatus(e.target.value)}>
-            <option value="">All statuses</option>
+            <option value="">{t("list.statusAll")}</option>
             {STATUS_OPTIONS.map((s) => (
               <option key={s} value={s}>
-                {s}
+                {t(`statuses.${s}`)}
               </option>
             ))}
           </select>
@@ -52,43 +56,44 @@ export function Vehicles() {
             checked={attentionOnly}
             onChange={(e) => setAttentionOnly(e.target.checked)}
           />
-          Attention only
+          {t("list.attentionOnly")}
         </label>
       </form>
 
       {error && <ErrorState message={error} />}
-      {!error && !vehicles && <LoadingState label="Loading fleet registry…" />}
-      {vehicles && vehicles.length === 0 && <EmptyState icon="fleet" title="No vehicles found" detail="Adjust the current fleet filters." />}
+      {!error && !vehicles && <LoadingState label={t("list.loading")} />}
+      {vehicles && vehicles.length === 0 && <EmptyState icon="fleet" title={t("list.empty")} detail={t("list.emptyDetail")} />}
 
       {vehicles && vehicles.length > 0 && (() => {
         const filtered = vehicles.filter((v) => `${v.public_ref} ${v.make} ${v.model} ${v.location}`.toLowerCase().includes(query.toLowerCase()));
-        return filtered.length === 0 ? <EmptyState icon="search" title="No matching vehicles" detail="Try a broader search term." /> : <div className="table-shell"><div className="table-meta"><span>{filtered.length} vehicles</span><span>Persisted fleet data</span></div><table className="data-table">
-          <caption className="visually-hidden">Vehicle fleet</caption>
+        return filtered.length === 0 ? <EmptyState icon="search" title={t("list.noMatch")} detail={t("list.noMatchDetail")} /> : <div className="table-shell"><div className="table-meta"><span>{t("list.count", { count: filtered.length })}</span><span>{t("list.persisted")}</span></div><table className="data-table">
+          <caption className="visually-hidden">{t("list.title")}</caption>
           <thead>
             <tr>
-              <th scope="col">Reference</th>
-              <th scope="col">Make / model</th>
-              <th scope="col">Location</th>
-              <th scope="col">Status</th>
-              <th scope="col">Odometer (km)</th>
-              <th scope="col">Attention</th>
+              <th scope="col">{t("list.columns.reference")}</th>
+              <th scope="col">{t("list.columns.makeModel")}</th>
+              <th scope="col">{t("list.columns.location")}</th>
+              <th scope="col">{t("list.columns.status")}</th>
+              <th scope="col">{t("list.columns.odometer")}</th>
+              <th scope="col">{t("list.columns.attention")}</th>
             </tr>
           </thead>
           <tbody>
             {filtered.map((v) => (
-              <tr key={v.public_ref} className={v.attention ? "row-attention" : ""}>
-                <th scope="row" data-label="Reference">
-                  <Link to={`/vehicles/${v.public_ref}`}>{v.public_ref}</Link>
+              <tr key={v.public_ref} className={`row-clickable ${v.attention ? "row-attention" : ""}`}>
+                <th scope="row" data-label={t("list.columns.reference")}>
+                  {v.public_ref}
+                  <Link className="row-link" to={`/vehicles/${v.public_ref}`}><span className="visually-hidden">{v.public_ref}</span></Link>
                 </th>
-                <td data-label="Make / model">
+                <td data-label={t("list.columns.makeModel")}>
                   {v.make} {v.model} ({v.model_year})
                 </td>
-                <td data-label="Location">{v.location}</td>
-                <td data-label="Status">
-                  <StatusBadge status={v.operational_status} />
+                <td data-label={t("list.columns.location")}>{v.location}</td>
+                <td data-label={t("list.columns.status")}>
+                  <StatusBadge status={v.operational_status} label={t(`statuses.${v.operational_status}`, { defaultValue: v.operational_status })} />
                 </td>
-                <td data-label="Odometer">{v.odometer_km.toLocaleString("en-GB")}</td>
-                <td data-label="Attention">{v.attention ? <span className="attention-flag">Needs attention</span> : "—"}</td>
+                <td data-label={t("list.columns.odometer")}>{formatNumber(v.odometer_km)}</td>
+                <td data-label={t("list.columns.attention")}>{v.attention ? <span className="attention-flag">{t("list.needsAttention")}</span> : "—"}</td>
               </tr>
             ))}
           </tbody>