feat(ui): add Logistics/Tickets tabbed navigation

- Wrap the existing analytics dashboard as the Logistics tab
- Add a scaffolded Tickets tab (per-tab KPIs, recent-tickets + by-status
  cards, informative empty state)
- Shared header KPI strip swaps per tab; tickets load lazily on first open
- Ticket data source left as a dashboard_api integration point — no S3
  credentials embedded in the static SPA

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/index.html

@@ -46,7 +46,7 @@
   }
   .app {
     display: grid; min-height: 100vh;
-    grid-template-rows: auto auto 1fr;   /* header · filter bar · content */
+    grid-template-rows: auto 1fr;   /* header · content (tabs/filters live inside each view) */
   }
 
   /* ── Top bar (mirrors FleetNow) ──────────────────────────────────────── */
@@ -83,6 +83,23 @@
   .clock .label { font-size: 9.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .6px; }
   .clock b { font-weight: 600; }
 
+  /* ── Tab nav (segmented control) ─────────────────────────────────────── */
+  .tabs {
+    display: flex; gap: 4px; background: var(--bg);
+    border: 1px solid var(--border); border-radius: 8px; padding: 3px;
+  }
+  .tab {
+    background: transparent; color: var(--muted); border: 0; border-radius: 6px;
+    padding: 6px 14px; font-size: 12.5px; font-weight: 700; letter-spacing: .3px;
+    cursor: pointer; white-space: nowrap;
+  }
+  .tab:hover { color: var(--text); }
+  .tab.active { background: var(--accent); color: #1a1009; }
+
+  /* ── Tabbed views ────────────────────────────────────────────────────── */
+  .view { display: none; }
+  .view.active { display: block; }
+
   /* ── Filter bar ──────────────────────────────────────────────────────── */
   .filterbar {
     padding: 10px 18px; background: var(--panel-2);
@@ -163,11 +180,17 @@
 <div class="app">
   <header>
     <div class="brand"><span class="mark"></span>FLEET<span class="nm">OPS</span></div>
+    <nav class="tabs" id="tabs">
+      <button class="tab active" data-tab="logistics" type="button">Logistics</button>
+      <button class="tab" data-tab="tickets" type="button">Tickets</button>
+    </nav>
     <div id="kpis"></div>
     <div class="spacer"></div>
     <div class="clock"><span class="label">EAT</span><b id="clock-time">—</b></div>
   </header>
 
+  <div class="content">
+  <section class="view active" id="view-logistics">
   <div class="filterbar">
     <div class="ff">
       <label for="f-cc">Cost centre</label>
@@ -213,6 +236,31 @@
       <div class="tbl-scroll" id="drv-wrap"><div class="empty">Loading…</div></div>
     </div>
   </main>
+  </section>
+
+  <section class="view" id="view-tickets">
+    <main id="main-tickets">
+      <div class="card span12">
+        <div class="banner" id="tk-banner">
+          Tickets data source not connected yet — this tab is scaffolded and ready to wire.
+          <ul>
+            <li>Ticket data must be served via <code>dashboard_api</code> (proxied / presigned from the rustfs <code>tickets</code> bucket); credentials are never embedded in this static SPA.</li>
+          </ul>
+        </div>
+      </div>
+
+      <div class="card span8">
+        <h2>Recent tickets <span class="count" id="tk-count"></span></h2>
+        <div class="tbl-scroll" id="tk-wrap"><div class="empty">Loading…</div></div>
+      </div>
+
+      <div class="card span4">
+        <h2>By status</h2>
+        <div id="tk-status"><div class="empty">Loading…</div></div>
+      </div>
+    </main>
+  </section>
+  </div>
 </div>
 
 <script>
@@ -432,6 +480,7 @@ async function loadAll() {
       api(`/analytics/fuel?${q}`),
     ]);
     const fuelL = ((fuel && fuel.rows) || []).reduce((s, r) => s + Number(r.actual_fuel_l || 0), 0);
+    lastTotals = summary.totals; lastFuelL = fuelL;
     renderKpis(summary.totals, fuelL);
     renderTrend(util.daily_trend);
     renderVehicles(summary.rows);
@@ -446,6 +495,50 @@ async function loadAll() {
   }
 }
 
+// ============================================================================
+// TABS  (Logistics ↔ Tickets)
+// ============================================================================
+// The header KPI strip is shared, so we cache the last logistics totals and
+// re-render them when switching back from Tickets.
+let lastTotals = null, lastFuelL = 0;
+const ticketStats = {};   // populated once a tickets data source is wired
+
+function renderTicketKpis() {
+  const k = [
+    ['accent', ticketStats.open ?? '—', 'Open'],
+    ['warn',   ticketStats.in_progress ?? '—', 'In progress'],
+    ['live',   ticketStats.resolved ?? '—', 'Resolved'],
+    ['', ticketStats.avg_resolution_h != null ? num(ticketStats.avg_resolution_h, 1) + 'h' : '—', 'Avg resolution'],
+  ];
+  $('kpis').innerHTML = k.map(([c, v, l]) =>
+    `<div class="kpi"><b class="${c}">${v}</b><span>${l}</span></div>`).join('');
+}
+
+let ticketsLoaded = false;
+async function loadTickets() {
+  // Integration point. FleetOps is a credential-less static SPA, so ticket data
+  // must arrive through dashboard_api (proxied / presigned from the rustfs
+  // `tickets` bucket) — never by embedding S3 keys here. Wire the fetch + the
+  // renderers below once that endpoint exists. Until then, show empty states.
+  ticketsLoaded = true;
+  $('tk-count').textContent = '';
+  $('tk-wrap').innerHTML = '<div class="empty">No ticket data source connected yet.</div>';
+  $('tk-status').innerHTML = '<div class="empty">—</div>';
+}
+
+function switchTab(name) {
+  document.querySelectorAll('.tab').forEach(b => b.classList.toggle('active', b.dataset.tab === name));
+  document.querySelectorAll('.view').forEach(v => v.classList.toggle('active', v.id === `view-${name}`));
+  if (name === 'tickets') {
+    renderTicketKpis();
+    if (!ticketsLoaded) loadTickets();
+  } else {
+    renderKpis(lastTotals, lastFuelL);
+  }
+}
+document.querySelectorAll('.tab').forEach(b =>
+  b.addEventListener('click', () => switchTab(b.dataset.tab)));
+
 // ============================================================================
 // BOOT
 // ============================================================================