-- Add display_mode support for tree testing studies
-- This allows tree tests to use either standard text-based navigation or visual navigation bar

-- The display_mode column should already exist from card sort feature
-- This just ensures it works for tree tests too
-- No schema changes needed - just documenting the feature

-- Valid display_mode values for tree_test studies:
-- 'standard' = Text-based tree navigation (original)
-- 'visual_nav' = Visual navigation bar with hover dropdowns

-- Note: If display_mode column doesn't exist, it will be created by the card sort migration
-- This is just a placeholder to document that tree tests now support both modes