e3895d30b4
Site admins can now temporarily view the site as a player, tournament admin, or club admin to understand the experience for each role. Changes: - Added RoleSwitcher context and provider for client-side role simulation - Added role switcher dropdown in Navigation (visible only to site admins) - Added yellow banner showing current viewing-as role with reset button - Navigation links and wordmark href now use effective role for conditional display - Added BDD feature file with 5 scenarios covering all role transitions - Added step definitions for site admin login and role switcher interactions The view-as feature is purely UI-level - server-side permissions remain unchanged. 5 scenarios, 27 steps, all passing.