feat: add onboarding checklist widget to dashboard

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

frontend/src/pages/QuickStartPage.tsx

@@ -26,6 +26,7 @@ import { QuickActions } from '@/components/dashboard/QuickActions'
 import { OpenSessions } from '@/components/dashboard/OpenSessions'
 import { RecentActivity } from '@/components/dashboard/RecentActivity'
 import { PreparedSessions } from '@/components/dashboard/PreparedSessions'
+import { OnboardingChecklist } from '@/components/dashboard/OnboardingChecklist'
 
 function timeAgo(dateStr: string): string {
   const now = Date.now()
@@ -278,6 +279,9 @@ export function QuickStartPage() {
         </p>
       </div>
 
+      {/* Onboarding Checklist */}
+      <OnboardingChecklist />
+
       {/* Row 1: Calendar + Quick Actions */}
       <div className="flex gap-4" style={{ alignItems: 'stretch' }}>
         <div className="flex-1 min-w-0">