The top-right overlay doubles as the state legend and the filter
surface: a search box (matches name or statement, case-insensitive)
plus one row per node state in reading order (taught, known, missed,
don't know, candidate) with its color dot, label, and total count.
Clicking a row toggles that state's visibility.
Filtering flows through sigma's official nodeReducer/edgeReducer
settings: hidden nodes drop out of rendering, hover, picking, AND
labels; edges drop when either endpoint is hidden; an open detail card
closes if its node is filtered out. Pure predicate (isNodeVisible) is
exported and covered by 7 tests; the reducers just consume its
verdict. Verified live: search 'Nietzsche' 5457->1687->5457 label px
(exact restore), known toggle drops 13 discs+labels and restores,
nonsense query shows the 'No matching nodes.' hint with zero labels,
counts 0/13/0/0/10 match the ledger.
amosblomqvist
094bafaf2d