feat(FN-1059): add manual heartbeat run trigger with execution details in agent UI

- Wire heartbeatMonitor into ServerOptions and pass through to API routes
- Add POST /api/agents/:id/runs route to trigger heartbeat execution with optional source/triggerDetail
- Update API client startAgentRun to accept optional source and triggerDetail parameters
- Add Run Heartbeat button to AgentsView and enhance AgentDetailView RunsTab with execution details and polling
- Add route handler tests for agent runs and UI static analysis tests
- Support run history display with status, duration, trigger type, and result details

packages/dashboard/src/server.ts

@@ -50,6 +50,11 @@ export interface ServerOptions {
     start(): void;
     stop(): void;
   };
+  /** Optional HeartbeatMonitor for triggering agent execution runs */
+  heartbeatMonitor?: {
+    startRun(agentId: string, options?: { source: import("@fusion/core").HeartbeatInvocationSource; triggerDetail?: string; contextSnapshot?: Record<string, unknown> }): Promise<import("@fusion/core").AgentHeartbeatRun>;
+    executeHeartbeat(options: { agentId: string; source: import("@fusion/core").HeartbeatInvocationSource; triggerDetail?: string; taskId?: string }): Promise<import("@fusion/core").AgentHeartbeatRun>;
+  };
 }
 
 type DashboardExpressApp = ReturnType<typeof express> & {