UI: add merged network triage guidance

[BadgerOps]

Summary

• add a Merged Network triage guide that points operators to link, relink, repair, and duplicate-review queues
• add selected-conflict operator notes for link, relink/merge, import, ignore, defer, and investigation decisions
• group repeated network issue badges and use operator-facing labels

Verification

• npm test -- DiscoveryNetworkConflictList.test.tsx useNetwork.test.tsx DiscoveryNetworkRelationshipTable.test.tsx
• npm run build
• git diff --check