The adaptive genre facet always self-excluded the genre filter ({**p,"genres":
None}). That's right for "any"/OR mode — each offered genre widens the result —
but wrong for "all"/AND mode, where adding a genre narrows: it kept showing
genres that don't co-occur with the current selection, so clicking them ANDed the
result to zero (dead-end chips). Now self-exclude only in "any" mode; in "all"
mode keep the filter applied so the facet returns only genres present on the
current result set.
Guard the empty-AND case: a zero-match combination would return facets.genres=[],
and the sidebar hides the whole genre section (chips + Any/All toggle) when it's
empty — trapping the user with no per-chip way to undo the selection. Always emit
the actively-selected genres (count 0 when dropped) so they stay visible and
removable.
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