When a model's weights aren't on disk, the green "Switch to this"
button on the card is replaced by a blue "Download" button that
calls /api/download directly with the model's repo and the right
mode (solo -> spark1, cluster -> both). One-click re-install of a
previously-deleted model, no more pasting the repo into the manual
download form.
Also adds a confirmation dialog showing the model name, size, and
target Spark(s) before kicking off the download — and disables the
button when another download is already in flight.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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