fix(web): clarify cumulative mileage evidence

vehicle-data-platform/apps/web/src/v2/pages/TrackPage.tsx

@@ -515,7 +515,7 @@ export default function TrackPage() {
             <span><small>速度</small><strong>{number(current?.speedKmh ?? 0)}<em> km/h</em></strong></span>
             <span><small>方向</small><strong>{direction(current?.directionDeg)}</strong></span>
             <span><small>SOC</small><strong>{current?.socAvailable ? `${number(current.socPercent)}%` : '—'}</strong></span>
-            <span><small>累计里程</small><strong>{trackPointMileageAvailable(current) ? number(current?.totalMileageKm ?? 0) : '—'}{trackPointMileageAvailable(current) ? <em> km</em> : null}</strong></span>
+            <span title="当前轨迹点设备上报的累计总里程，不是所选时间窗里程或今日里程"><small>累计总里程</small><strong>{trackPointMileageAvailable(current) ? number(current?.totalMileageKm ?? 0) : '—'}{trackPointMileageAvailable(current) ? <em> km</em> : null}</strong></span>
           </div>
           <div className={`v2-track-current-evidence v2-track-current-coverage${track.coverage.complete ? '' : ' is-warning'}`}>
             <ProtocolTag className="v2-track-protocol-tag" protocol={current?.protocol} compact />