Allow CSS variables to be grouped under sub-paths and imported via
@import "hugo:vars/mobile" (or @use for Dart Sass), so callers can pass
nested dicts like:
{{ dict "primary-color" "blue" "mobile" (dict "primary-color" "red") }}
Top-level "hugo:vars" now skips nested map entries instead of emitting
garbage for them.
Fixes#14705
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Bjørn Erik Pedersen
7622dd86ce