* ui : model download pipeline
Track HuggingFace downloads end to end: the server download/cancel endpoints,
a status manager fed by the /models/sse download progress events, and a
models-discover store holding the catalog and detail state for the discover
view. Downloaded and in-flight entries are excluded from the loadable model
list.
Assisted-by: pi:GLM-5.3-Flash
* ui : route sidecar tag lookup through the sidecars util, validate the paused list
Assisted-by: pi:zai-org/GLM-5.3-Flash