feat(slots): block + blob download modal on the slot detail page#437
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Add a Download modal to the slot detail page with a Block tab (JSON/SSZ) and a Blobs tab (one row per blob, download by versioned hash). Downloads go through the lab-backend download proxy via a same-origin fetch+save hook that surfaces archive 404s inline. Blob list currently sources versioned hashes from dim_block_blob_submitter; to be repointed at fct_block_blob_head (head-timely) once that CBT table is deployed.
The Blobs tab now self-fetches the slot's versioned hashes from the head table fct_block_blob_head (real-time) instead of dim_block_blob_submitter (which lags the chain head and was empty for recent slots). Queried by slot_start_date_time since the cbt-api slot projection filter does not match.
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Adds a Download modal to the slot deep-dive page with a Block tab (download the beacon block as JSON or SSZ) and a Blobs tab (download each blob sidecar by versioned hash). Downloads go through the lab-backend download proxy (ethpandaops/lab-backend#65) via a same-origin fetch-and-save hook that surfaces archive 404s inline (e.g. a not-yet-archived recent slot). Depends on lab-backend#65 for the
/api/v1/download/...endpoint.The Blobs tab currently sources versioned hashes from
dim_block_blob_submitter(execution submitter, lags until the EL block is processed, so recent slots show no blobs); a follow-up will repoint it at the head-timelyfct_block_blob_head(ethpandaops/xatu-cbt#285) once that table is deployed and the API types are regenerated.