Price-history tracking config: whether it's on and how many points to keep.
Query-cache config: whether caching is on, empty-result handling, and TTL.
Supplier deny-list and limits config.
Search behavior config: variant grouping and restricted-product filtering.
Results-table display config: empty-column auto-hiding and default-hidden columns.
UI presentation config: theme, font scale, and toolbar-icon behavior.
The nested settings groups a NESTED_* reducer action can target.
Application configuration settings that control various features and behaviors. Used to store user preferences and feature flags.