Improve heartbeat-run CLI and agent detail UI

Rework heartbeat-run command with better error handling and output
formatting. Improve AgentConfigForm field layout. Add CSS for agent
run timeline. Enhance AgentDetail page with runtime status section.

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

ui/src/pages/AgentDetail.tsx

@@ -210,6 +210,16 @@ export function AgentDetail() {
               </Button>
             </PopoverTrigger>
             <PopoverContent className="w-44 p-1" align="end">
+              <button
+                className="flex items-center gap-2 w-full px-2 py-1.5 text-xs rounded hover:bg-accent/50"
+                onClick={() => {
+                  navigator.clipboard.writeText(agent.id);
+                  setMoreOpen(false);
+                }}
+              >
+                <Copy className="h-3 w-3" />
+                Copy Agent ID
+              </button>
               <button
                 className="flex items-center gap-2 w-full px-2 py-1.5 text-xs rounded hover:bg-accent/50"
                 onClick={() => {