The Library Explorer caret now says what it does on hover (Show/Hide
filter panels, all eight locales). While the panels are collapsed with
filters applied, a single-line strip of removable chips stays visible
next to the caret (top of the results area for the left/right rail
layouts), so hiding the panels never hides what is filtering the
results. The chip is the empty-state delegate extracted into a shared
component; removal reuses clearFilterChip verbatim.
cc
vicrodh
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