Add live badge to issues with active runs on /issues/active

Server: the /companies/:companyId/live-runs endpoint now returns
issueId extracted from contextSnapshot, so the UI can match runs
to issues without N+1 queries.

UI (Issues.tsx): fetches company live runs (with 5s polling), builds
a set of issue IDs with active runs, and shows a pulsing "Live" badge
in each matching issue row — matching the existing blue live indicator
style from AgentDetail.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/routes/agents.ts

@@ -906,6 +906,7 @@ export function agentRoutes(db: Db) {
         agentId: heartbeatRuns.agentId,
         agentName: agentsTable.name,
         adapterType: agentsTable.adapterType,
+        issueId: sql<string | null>`${heartbeatRuns.contextSnapshot} ->> 'issueId'`.as("issueId"),
       })
       .from(heartbeatRuns)
       .innerJoin(agentsTable, eq(heartbeatRuns.agentId, agentsTable.id))