fix: add web-probe screenshot and tighten sentinel dashboard

scripts/src/hwlab-node-web-sentinel-dashboard-assets.ts

@@ -63,7 +63,7 @@ export function renderWebProbeSentinelDashboardHtml(config: DashboardShellConfig
 
     <section class="metric-grid" aria-label="哨兵状态指标">
       <article class="metric-card">
-        <span class="metric-label">总体状态</span>
+        <span class="metric-label">当前状态</span>
         <strong id="metric-overall">-</strong>
         <small id="metric-origin">-</small>
       </article>
@@ -73,7 +73,7 @@ export function renderWebProbeSentinelDashboardHtml(config: DashboardShellConfig
         <small id="metric-latest-age">-</small>
       </article>
       <article class="metric-card">
-        <span class="metric-label">发现项</span>
+        <span class="metric-label">历史发现项</span>
         <strong id="metric-findings">0</strong>
         <small id="metric-findings-note">-</small>
       </article>