feat(live): reimagine consensus Live page top bar as a slot HUD#439
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Replace the slot-phase strip with a dense, live dashboard built from xatu-cbt per-slot data: an EL-client validation race (engine_newPayload on the EIP-7870 reference nodes), block propagation percentiles, attestation timing, MEV outcome, MEV auction depth, execution payload and block status. Each section fades in on the slot replay timeline. Adds a condensed mobile stat row. Also: - Query fct_block_mev_head instead of fct_block_mev (canonical table is empty for live slots, so every block read as self-built). - Colour map nodes by block-propagation speed. - Fix map dot flicker: stabilise Map2D empty-array defaults and scope the SlotLiveDataProvider reset to slot changes. - Reduce live-query refetch churn (shared staleTime + no window-focus refetch). - Tooltips on truncated values; centralise the 7870 marker constant.
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Replaces the sparse slot-phase strip on the Ethereum → Live page with a dense, live "slot HUD" built from xatu-cbt per-slot data: an EL-client engine_newPayload race on the EIP-7870 reference nodes, plus propagation, attestation timing, MEV outcome, MEV auction depth, execution payload, and block status, each fading in on the slot replay timeline, with a condensed mobile stat row. Also switches MEV to fct_block_mev_head (the canonical table is empty for live slots, so blocks previously read as self-built), colours the world-map nodes by propagation speed, fixes the map dot flicker, reduces live-query refetch churn, and adds hover tooltips on truncated values.