ui: humanize door/vibration/magnet status labels

Replace raw snake_case values (magnet: no_magnet) with proper labels:
- Door: Closed / Opened / Opening / Closing
- Vibration: Idle / Vibration!
- Magnet: None / Detected!
- Event count singular/plural correction (1 event vs N events)

dashboard/static/index.html

@@ -190,16 +190,32 @@ function rssiTone(rssi) {
   return 'rose';
 }
 
+const HUMAN = {
+  door_status: {
+    closed: 'Closed', opened: 'Opened',
+    opening_alert: 'Opening', closing_alert: 'Closing',
+  },
+  vibration_status: { no_vibration: 'Idle', vibration_detected: 'Vibration!' },
+  magnet_status:    { no_magnet: 'None', magnet_detected: 'Detected!' },
+};
+
+function humanize(field, value) {
+  return HUMAN[field]?.[value] ?? value;
+}
+
 function summaryLine(d) {
   if (!d) return '—';
   const p = [];
   if ('temperature_c' in d) p.push(`${d.temperature_c}°C`);
   if ('humidity_pct' in d) p.push(`${d.humidity_pct}%`);
   if ('brightness_lux' in d) p.push(`${d.brightness_lux} lux`);
-  if ('door_status' in d) p.push(`door: ${d.door_status}`);
+  if ('door_status' in d) p.push(humanize('door_status', d.door_status));
-  if ('vibration_status' in d) p.push(`vibration: ${d.vibration_status}`);
+  if ('vibration_status' in d) p.push(humanize('vibration_status', d.vibration_status));
-  if ('magnet_status' in d) p.push(`magnet: ${d.magnet_status}`);
+  if ('magnet_status' in d) p.push(humanize('magnet_status', d.magnet_status));
-  if ('event_count' in d && d.mode_id > 2) p.push(`${d.event_count} events`);
+  if ('event_count' in d && d.mode_id > 2) {
+    const label = d.event_count === 1 ? 'event' : 'events';
+    p.push(`${d.event_count} ${label}`);
+  }
   if ('fw_major' in d) p.push(`fw ${d.fw_major}.${d.fw_minor}`);
   if (p.length === 0) p.push('heartbeat');
   return p.join(' · ');