caidows/dsh-codex-model-picker

Codex-style composer model picker: a card showing the current model and a draggable slider that sets reasoning effort, with one stop per level the model advertises and an Off stop when the provider supports it. The slider snaps only to whole stops and updates the effort label while dragging; selecting a model or effort still goes through the session model directory, so it stays in sync with the rest of the composer.