Counts the number of active filter values (for mobile badge).

Builds a URL path with filter query params.

Merges filter state into a clean query string, preserving page param only when keep_page is true.

Converts active filter state into keyword opts for Shop.list_products_with_count/1.

Builds a query string from active filter state (e.g. "?price_min=10&price_max=100" or "").

Used to append filter params to navigation links so filter state persists across page transitions.

Returns true if any filters are currently active.

Loads enabled filters and their aggregated values.

Returns {filters, filter_values} tuple.

Options:

• :category_uuid - Scope aggregation to a category by UUID

Parses URL query params into active filter state.

Returns a map: %{"price" => %{min: Decimal, max: Decimal}, "vendor" => ["V1", "V2"], ...}

Toggles a value in a checkbox-type filter. Returns updated active_filters map.

Updates price range filter. Returns updated active_filters map.