refactor: extract duplicated utility functions into shared modules

Consolidate 20+ duplicate function definitions across UI components into
three shared util files (format-utils, agent-utils, config-draft-utils).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/utils/agent-utils.ts

@@ -0,0 +1,53 @@
+import type { FeedEvent } from '@cameleer/design-system';
+import type { LogEntry } from '@cameleer/design-system';
+import { UserPlus, UserMinus, Play, Square, Clock, Skull, HeartPulse, Route, Send, Activity } from 'lucide-react';
+import { createElement } from 'react';
+
+export function formatUptime(seconds?: number): string {
+  if (!seconds) return '\u2014';
+  const days = Math.floor(seconds / 86400);
+  const hours = Math.floor((seconds % 86400) / 3600);
+  const mins = Math.floor((seconds % 3600) / 60);
+  if (days > 0) return `${days}d ${hours}h`;
+  if (hours > 0) return `${hours}h ${mins}m`;
+  return `${mins}m`;
+}
+
+export function mapLogLevel(level: string): LogEntry['level'] {
+  switch (level?.toUpperCase()) {
+    case 'ERROR': return 'error';
+    case 'WARN': case 'WARNING': return 'warn';
+    case 'DEBUG': return 'debug';
+    case 'TRACE': return 'trace';
+    default: return 'info';
+  }
+}
+
+export function eventSeverity(type: string): FeedEvent['severity'] {
+  switch (type) {
+    case 'WENT_DEAD':
+    case 'AGENT_STOPPED':
+    case 'DEREGISTERED': return 'error';
+    case 'WENT_STALE': return 'warning';
+    case 'RECOVERED':
+    case 'REGISTERED':
+    case 'AGENT_STARTED': return 'success';
+    default: return 'running';
+  }
+}
+
+export function eventIcon(type: string) {
+  switch (type) {
+    case 'REGISTERED': return createElement(UserPlus, { size: 14 });
+    case 'DEREGISTERED': return createElement(UserMinus, { size: 14 });
+    case 'AGENT_STARTED': return createElement(Play, { size: 14 });
+    case 'AGENT_STOPPED': return createElement(Square, { size: 14 });
+    case 'WENT_STALE': return createElement(Clock, { size: 14 });
+    case 'WENT_DEAD': return createElement(Skull, { size: 14 });
+    case 'RECOVERED': return createElement(HeartPulse, { size: 14 });
+    case 'ROUTE_STATE_CHANGED': return createElement(Route, { size: 14 });
+    case 'COMMAND_DELIVERED':
+    case 'COMMAND_ACKNOWLEDGED': return createElement(Send, { size: 14 });
+    default: return createElement(Activity, { size: 14 });
+  }
+}