feat(tickets): center the overview, remove its filter row

The INC/CRQ overview is now a centered "today" snapshot — header + metric tiles
centered. Removed the overview filter row (Cluster/Status/Window/Apply/refresh):
the Ticket explorer below carries the ad-hoc filtering, so it was redundant.
incQs() is fixed to window=today; dropped initIncDropdowns + the removed listeners.

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

src/index.html

@@ -225,8 +225,8 @@
   }
 
   /* INC metric strip */
-  .metric-row { display: flex; flex-wrap: wrap; gap: 26px; }
-  .metric { display: flex; flex-direction: column; min-width: 96px; }
+  .metric-row { display: flex; flex-wrap: wrap; gap: 26px; justify-content: center; }
+  .metric { display: flex; flex-direction: column; align-items: center; text-align: center; min-width: 96px; }
   .metric b { font-size: 22px; line-height: 1.1; font-variant-numeric: tabular-nums; }
   .metric b.accent { color: var(--accent); }
   .metric .lbl { font-size: 9.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .6px; margin-top: 3px; }
@@ -238,9 +238,7 @@
   .sla-unknown  { color: var(--muted); }
 
   /* INC overview row: metric tiles (left) + filters (right) on one balanced row */
-  .tk-overview-row { display: flex; align-items: center; justify-content: space-between; gap: 16px 28px; flex-wrap: wrap; }
-  .tk-overview-metrics { min-width: 0; }
-  .tk-filters { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-left: auto; }
+  .tk-overview-metrics { min-width: 0; text-align: center; }
   .tk-filters .ff select, .tk-filters .ff input { min-width: 130px; }
 
   /* Live vehicle DOM marker (ported from FleetNow) */
@@ -411,35 +409,10 @@
   </div>
   <main id="tk-main">
     <div class="card span12">
-      <div class="tk-overview-row">
       <div class="tk-overview-metrics">
         <h2><span id="tk-ds-ov">INC</span> overview <span class="count" id="tk-fresh"></span></h2>
         <div class="metric-row" id="tk-metrics"><div class="empty">Loading…</div></div>
       </div>
-        <div class="tk-filters">
-          <div class="ff">
-            <label for="tk-cluster">Cluster</label>
-            <select id="tk-cluster"><option value="">All clusters</option></select>
-          </div>
-          <div class="ff">
-            <label for="tk-status">Status</label>
-            <select id="tk-status"><option value="">All statuses</option></select>
-          </div>
-          <div class="ff">
-            <label for="tk-window">Window</label>
-            <select id="tk-window">
-              <option value="today" selected>Today</option>
-              <option value="week">This week</option>
-              <option value="month">This month</option>
-              <option value="custom">Custom range</option>
-            </select>
-          </div>
-          <div class="ff custom" id="tk-ff-start"><label for="tk-start">Start</label><input type="date" id="tk-start"></div>
-          <div class="ff custom" id="tk-ff-end"><label for="tk-end">End</label><input type="date" id="tk-end"></div>
-          <button class="btn" id="tk-apply" type="button">Apply</button>
-          <button class="btn ghost" id="tk-refresh" type="button" title="Reload">↻</button>
-        </div>
-      </div>
     </div>
 
     <div class="card span12">
@@ -929,9 +902,9 @@ function setDataset(ds) {
   const U = ds.toUpperCase();
   $('tk-ds-ov').textContent = U;
   $('tk-ds-map').textContent = U;
-  // per-dataset dropdowns + explorer results are stale → clear and re-init
-  incDropdownsInit = false; incFilterOptionsInit = false;
-  ['tk-cluster', 'tk-status', 'tk-x-eng', 'tk-x-cluster'].forEach(resetSelect);
+  // per-dataset explorer dropdowns + results are stale → clear and re-init
+  incFilterOptionsInit = false;
+  ['tk-x-eng', 'tk-x-cluster'].forEach(resetSelect);
   $('tk-x-id').value = ''; $('tk-x-id-list').innerHTML = '';
   $('tk-x-count').textContent = '';
   $('tk-x-wrap').innerHTML = '<div class="empty">Search by ticket id, engineer, cluster, state and time.</div>';
@@ -1009,7 +982,7 @@ let tkMap = null, tkPopup = null, tkLivePoll = null, tkClosureChart = null;
 const tkMarkers = new Map();                            // imei → maplibregl.Marker
 const tkLayerState = { open: true, closed: true, vehicles: true };
 let tkOwnerFilter = null;   // when set, the closed layer is filtered to this engineer (drill-down)
-let incData = null, incDropdownsInit = false, vehCount = 0;
+let incData = null, vehCount = 0;
 let DS = 'inc';   // active Tickets dataset (inc | crq) — drives /webhook/${DS}-* endpoints + labels
 let tkLoadedDay = null;   // EAT calendar day of the last INC load — drives the midnight auto-rollover
 const eatDay = () => new Date().toLocaleDateString('en-CA', { timeZone: 'Africa/Nairobi' });
@@ -1023,18 +996,10 @@ function eatShort(iso) {
 }
 function addDay(ymd) { const [y, m, d] = ymd.split('-').map(Number); return new Date(Date.UTC(y, m - 1, d + 1)).toISOString().slice(0, 10); }
 
+// The overview is a fixed "today" snapshot now that its filter row is removed —
+// ad-hoc cluster / status / time filtering lives in the Ticket explorer below.
 function incQs() {
-  const p = new URLSearchParams();
-  if ($('tk-cluster').value) p.set('cluster', $('tk-cluster').value);
-  if ($('tk-status').value)  p.set('status', $('tk-status').value);
-  const w = $('tk-window').value;
-  if (w === 'custom') {
-    if ($('tk-start').value) p.set('from', $('tk-start').value + 'T00:00:00+03:00');
-    if ($('tk-end').value)   p.set('to', addDay($('tk-end').value) + 'T00:00:00+03:00');  // inclusive end
-  } else {
-    p.set('window', w);
-  }
-  return p.toString();
+  return 'window=today';
 }
 
 // Squircle + bolt map marker: a rounded squircle tapering to a bottom point (anchors on
@@ -1125,14 +1090,8 @@ function renderIncMap() {
 function initIncMap() {
   if (tkMap) { tkMap.resize(); return; }               // already built — just fix sizing
 
-  // Filter / control listeners (attached once, with the map).
-  $('tk-window').addEventListener('change', () => {
-    const custom = $('tk-window').value === 'custom';
-    $('tk-ff-start').classList.toggle('show', custom);
-    $('tk-ff-end').classList.toggle('show', custom);
-  });
-  $('tk-apply').addEventListener('click', loadInc);
-  $('tk-refresh').addEventListener('click', loadInc);
+  // Control listeners (attached once, with the map). The overview filter row was
+  // removed (it's a fixed "today" snapshot); the explorer carries its own filters.
   $('tk-layers-toggle').addEventListener('click', () => $('tk-layers').classList.toggle('collapsed'));
 
   // Ticket explorer controls
@@ -1327,23 +1286,12 @@ async function loadIncSearch() {
   }
 }
 
-// Populate the Cluster / Status filters from the first unfiltered response.
-function initIncDropdowns(m) {
-  const fill = (id, obj) => {
-    const el = $(id);
-    Object.keys(obj || {}).filter(k => k !== '').sort().forEach(k => el.add(new Option(k, k)));
-  };
-  fill('tk-cluster', m.by_cluster);
-  fill('tk-status', m.by_status);
-}
-
 async function loadInc() {
   $('tk-main').classList.add('loading');
   try {
     const j = await api(`/webhook/${DS}-dashboard?${incQs()}`);
     incData = j;
     tkLoadedDay = eatDay();
-    if (!incDropdownsInit && j.metrics) { initIncDropdowns(j.metrics); incDropdownsInit = true; }
     renderIncMetrics(j.metrics, j.freshness);
     renderIncMap();   // fan out co-located pins so open (vivid) + closed (faded) both show
     buildIncLayers();