chore(hackathon): remove console.log statements and improve error handling

- Remove all console.log statements from middleware, layout, and pages
- Replace alert with toast for onboarding error messages
- Delete unused page-original.tsx backup file
- Keep console.error for actual error debugging

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/hackathon/src/app/teams/[teamId]/page.tsx

@@ -30,8 +30,6 @@ const TeamDashboardPage: FC = (): ReactElement => {
   const isMember = members.some((member: any) => member.user_id === currentUserId);
   const canInvite = isLeader && members.length < MAX_TEAM_MEMBERS;
 
-  console.log('Leader check:', { currentUserId, leaderId: team?.leader_id, isLeader });
-
   const handleInviteMember = async (e: React.FormEvent) => {
     e.preventDefault();
     if (!inviteEmail.trim() || isInviting) return;