Function updateTeamUser

updateTeamUser(
    team_id: string,
    user_id: string,
    role: "user" | "admin",
): Promise<void>
Updates a user's role within a team or adds the user to the team if not already a member.
Parameters
- team_id: string
  The ID of the team.
- user_id: string
  The ID of the user.
- role: "user" | "admin"
  
  The new role for the user.
Returns Promise<void>

Throws

If the database update operation fails.
- Defined in src/lib/server/teamService.ts:142