7acd099b3e
Detect fzf version once at shell startup inside fzf_key_bindings. Use bg-transform (non-blocking) on fzf >= 0.62 and the synchronous transform on older builds (e.g. 0.60 devel which lacks bg-transform). The chosen action is captured into fzf-history-widget via fish's --inherit-variable so the check runs once, not on every Ctrl+R press.