feat(FN-1862): add completion state tracking for onboarding

- Add markOnboardingCompleted() to set completedAt timestamp when user finishes onboarding
- Add isOnboardingCompleted() to check if onboarding was completed (vs dismissed)
- Update ModelOnboardingModal to call markOnboardingCompleted on successful completion
- Skip onboarding auto-open when already completed locally
- Add completion state tracking tests in ModelOnboardingModal.test.tsx
- Add model-onboarding-state unit tests
- Update useAuthOnboarding to check local completion state before auto-opening
- Document localStorage completion state tracking pattern in .fusion/memory.md

packages/dashboard/app/components/ProjectOverview.tsx

@@ -102,13 +102,12 @@ export function ProjectOverview({
         case "name":
           comparison = a.project.name.localeCompare(b.project.name);
           break;
-        case "activity": {
+        case "activity":
           const aTime = a.project.lastActivityAt || a.health?.lastActivityAt || a.project.updatedAt;
           const bTime = b.project.lastActivityAt || b.health?.lastActivityAt || b.project.updatedAt;
           comparison = new Date(bTime).getTime() - new Date(aTime).getTime();
           break;
-        }
-        case "status": {
+        case "status":
           const statusOrder: Record<ProjectStatus, number> = {
             errored: 0,
             initializing: 1,
@@ -117,7 +116,6 @@ export function ProjectOverview({
           };
           comparison = statusOrder[a.project.status] - statusOrder[b.project.status];
           break;
-        }
       }
 
       return sortDirection === "asc" ? comparison : -comparison;