fix(admin): remove unused network health DOM refs

CodeQL flagged unused getElementById bindings; run status and target
count are updated via setStatusText/setMetricValue instead.

Author: Ferryx349

resources/admin/assets/dashboard.js

@@ -39,8 +39,6 @@
   const networkHealthEmpty = document.getElementById('network-health-empty')
   const networkHealthSummary = document.getElementById('network-health-summary')
   const networkHealthResults = document.getElementById('network-health-results')
-  const networkHealthRunStatus = document.getElementById('network-health-run-status')
-  const networkHealthTargetCount = document.getElementById('network-health-target-count')
   const networkHealthRunAt = document.getElementById('network-health-run-at')
 
   let settingsLoaded = false