Each recipe catalog entry now carries two variants:
variants.pip → uv pip install …
variants.docker → docker pull <image>
A small 'Install via' pill row in the panel toggles between them
(default = Pip/uv per the user's preference). Switching variant or
changing the model re-renders the <pre> via _refreshRecipePre(); the
display text drops the 'source venv/bin/activate' prefix for Docker
since docker pull doesn't need a venv. Run honours the active variant
so picking Docker queues 'docker pull …' as the tmux task.
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