8a56ebff2c20f339d81678d77297a7f4929b60c1
unlocked_decks + buds M2M widgets from SelectMultiple to filter_horizontal (dual-listbox). The default SelectMultiple widget renders ALL DeckVariant/User rows in a single listbox with only the currently-selected ones blue-highlighted — visually indistinguishable from "all of these are unlocked" if the reader doesn't notice the highlight state. This cost a half-hour staging bug investigation: Fiorentine Minchiate appeared in the listbox for admin disco and was read as "unlocked", but the Game Kit + Card Decks applets correctly rendered only Earthman because only Earthman was actually in unlocked_decks (Fiorentine was an *available option*, not a selected value). filter_horizontal splits into "Available" (left) + "Chosen" (right) panes with explicit arrows between — selected vs available is unambiguous. Same trap applies to buds (also a bare M2M per [[project-deck-contribution-spec]] adjacent note), so fixing both. No model/template/test changes — just the admin widget. UserAdminTest only exercises the changelist (/admin/lyric/user/), not the change form, so no test impact
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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