The top sync chips and the Sync column's own select filter were two independent
states with different vocab (all/needs_full/fully_synced vs fully/needsFull) and
subtly different semantics. DataTable gains a controlled filters/onFiltersChange
pair (symmetric to the existing controlled sort); ChannelsProvider now owns the
filter map via a new useFilterState hook, so the top chips, the Sync column
funnel, the card layout, and the header "full history" deep-link all drive ONE
filters.sync. The card layout reuses the exported filterRows predicate instead of
its own status pre-filter. Vocab unified on the column's fully = recent_synced &&
backfill_done, which now matches the Sync cell's own "fully synced" badge.
peter
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