fix(charts): correct total usage calculation in tooltip and node stats modal

Author: x0sina

dashboard/src/components/charts/all-nodes-stacked-bar-chart.tsx

@@ -165,7 +165,7 @@ function CustomTooltip({ active, payload, chartConfig, dir, period }: TooltipPro
       <div className={`mb-1.5 flex items-center justify-center gap-1.5 text-center text-[10px] text-muted-foreground sm:text-xs`}>
         <span>{t('statistics.totalUsage', { defaultValue: 'Total' })}: </span>
         <span dir="ltr" className="inline-block truncate font-mono">
-          {nodesToShow.reduce((sum, node) => sum + node.usage, 0).toFixed(2)}
+          {activeNodes.reduce((sum, node) => sum + node.usage, 0).toFixed(2)}
           GB
         </span>
       </div>

dashboard/src/components/dialogs/node-stats-modal.tsx

@@ -143,12 +143,6 @@ const NodeStatsModal = ({ open, onClose, data, chartConfig, period, allChartData
   const canGoLeft = isRTL ? canGoNext : canGoPrevious
   const canGoRight = isRTL ? canGoPrevious : canGoNext
 
-  // Calculate total usage
-  const totalUsage = Object.keys(data).reduce((sum, key) => {
-    if (key.startsWith('_uplink_') || key.startsWith('_downlink_') || key === 'time' || key === '_period_start') return sum
-    return sum + (data[key] || 0)
-  }, 0)
-
   // Calculate total uplink and downlink
   const totalUplink = Object.keys(data)
     .filter(key => key.startsWith('_uplink_'))
@@ -206,7 +200,7 @@ const NodeStatsModal = ({ open, onClose, data, chartConfig, period, allChartData
                 </span>
               </div>
               <Badge dir="ltr" variant="secondary" className="px-2 py-1 font-mono text-xs sm:text-sm">
-                {totalUsage.toFixed(2)} GB
+                {formatBytes(totalUplink + totalDownlink)}
               </Badge>
             </div>