- Description showed "20 m = 0.02 km km" — display_value already
includes the unit symbol, removed redundant r.target_symbol
- Icon changed from "edit-find-replace" to "edit-find-replace-symbolic"
which exists in Adwaita
- Currency aliases (dollar, euro, etc.) now resolve in convert_to and
convert_common — they were only handled by find_unit (parser validation)
but not by lookup_unit (actual conversion)
