Add low voltage status to control dashboard

public/assets/app.js

@@ -21,6 +21,9 @@
         statusDisk: $('#statusDisk'),
         statusMemory: $('#statusMemory'),
         statusUptime: $('#statusUptime'),
+        statusLowVoltage: $('#statusLowVoltage'),
+        statusLowVoltageLast: $('#statusLowVoltageLast'),
+        statusLowVoltageDuration: $('#statusLowVoltageDuration'),
         statusBatteryVoltage: $('#statusBatteryVoltage'),
         statusBatterySoc: $('#statusBatterySoc'),
         statusBatteryRemaining: $('#statusBatteryRemaining'),
@@ -88,6 +91,15 @@
             diskRoot: 'Disk',
             memory: 'Memory',
             uptime: 'Uptime',
+            lowVoltage: 'Low Voltage',
+            lowVoltageLast: 'Last Low Voltage',
+            lowVoltageDuration: 'LV Duration',
+            lowVoltageActive: 'Active',
+            lowVoltageNormal: 'Normal',
+            lowVoltageSeen: 'seen since boot',
+            lowVoltageNotSeen: 'not seen since boot',
+            currentEpisode: 'current',
+            lastEpisode: 'last',
             batteryV: 'Battery V',
             batterySoc: 'Battery SOC',
             sensorHistory: 'Sensor History',
@@ -221,6 +233,15 @@
             diskRoot: '디스크',
             memory: '메모리',
             uptime: '가동 시간',
+            lowVoltage: '저전압',
+            lowVoltageLast: '최근 저전압',
+            lowVoltageDuration: '저전압 지속',
+            lowVoltageActive: '감지 중',
+            lowVoltageNormal: '정상',
+            lowVoltageSeen: '부팅 후 이력 있음',
+            lowVoltageNotSeen: '부팅 후 이력 없음',
+            currentEpisode: '현재',
+            lastEpisode: '최근',
             batteryV: '배터리 전압',
             batterySoc: '배터리 SOC',
             sensorHistory: '센서 이력',
@@ -756,6 +777,27 @@
         return formatDhms(parseWifiDurationSeconds(value)) || value;
     }
 
+    function lowVoltageStateText(lowVoltage) {
+        if (!lowVoltage || lowVoltage.available === false) {
+            return t('na');
+        }
+
+        const stateText = lowVoltage.active ? t('lowVoltageActive') : t('lowVoltageNormal');
+        const seenText = lowVoltage.seen_since_boot ? t('lowVoltageSeen') : t('lowVoltageNotSeen');
+        return `${stateText} (${seenText})`;
+    }
+
+    function lowVoltageDurationText(lowVoltage) {
+        if (!lowVoltage || lowVoltage.available === false) {
+            return t('na');
+        }
+
+        const seconds = Number(lowVoltage.duration_seconds ?? 0);
+        const label = lowVoltage.active ? t('currentEpisode') : t('lastEpisode');
+        const formatted = formatDhms(seconds) || '-';
+        return `${label}: ${formatted}`;
+    }
+
     function timeAgo(seconds) {
         const formatted = formatDhms(seconds);
         return formatted ? `${formatted} ${t('ago')}` : '-';
@@ -786,6 +828,7 @@
         const disk = system.disk || {};
         const memory = system.memory || {};
         const battery = data.battery || {};
+        const lowVoltage = system.low_voltage || {};
         const load = Array.isArray(system.load) ? system.load : [];
         const activeUsers = system.active_users || {};
 
@@ -795,6 +838,9 @@
         setText(els.statusDisk, `${Number(disk.used_kb || 0).toLocaleString()} / ${Number(disk.total_kb || 0).toLocaleString()} KB (${disk.percent ?? '-'}%)`);
         setText(els.statusMemory, `${memory.used_mb ?? '-'} / ${memory.total_mb ?? '-'} MB (${memory.percent ?? '-'}%)`);
         setText(els.statusUptime, system.uptime || '-');
+        setText(els.statusLowVoltage, lowVoltageStateText(lowVoltage));
+        setText(els.statusLowVoltageLast, lowVoltage.last_detected_at || '-');
+        setText(els.statusLowVoltageDuration, lowVoltageDurationText(lowVoltage));
         setText(els.statusBatteryVoltage, battery.voltage === null || battery.voltage === undefined ? '-' : `${Number(battery.voltage).toFixed(3)} V`);
         setText(els.statusBatterySoc, battery.percent === null || battery.percent === undefined ? '-' : `${Number(battery.percent).toFixed(2)}%`);
         setText(els.statusBatteryRemaining, battery.remaining?.display || '-');