fix(history): drop jjf entry on cancel/error paths too

Previously, the original `jjf …` invocation only got dropped from
history on successful confirm. A cancelled or errored picker left a
useless `jjf …` entry behind. Now bash drops it unconditionally via
`_jjf_drop_last_history`; fish arms the postexec hook before the
`--emit` call so the deletion happens regardless of exit path.

src/init/bash.sh

@@ -1,3 +1,9 @@
+_jjf_drop_last_history() {
+    local _off
+    _off=$(history 1 2>/dev/null | awk '{print $1}')
+    [ -n "$_off" ] && history -d "$_off" 2>/dev/null || true
+}
+
 jjf() {
     # No args → default to `show` so `jjf` alone is a rev browser.
     if [ $# -eq 0 ]; then
@@ -9,13 +15,13 @@ jjf() {
         return $?
     fi
     local _jjf_cmd
-    _jjf_cmd="$(command jjf --emit "$@")" || return $?
-    [ -n "$_jjf_cmd" ] || return 130
-    # Replace the original `jjf …` history entry with the resolved jj command.
-    local _jjf_last_offset
-    _jjf_last_offset=$(history 1 2>/dev/null | awk '{print $1}')
-    if [ -n "$_jjf_last_offset" ]; then
-        history -d "$_jjf_last_offset" 2>/dev/null || true
+    _jjf_cmd="$(command jjf --emit "$@")"
+    local _jjf_rc=$?
+    # Always drop the `jjf …` entry from history; on cancel/error there's
+    # nothing to replace it with, on success we add the resolved command below.
+    _jjf_drop_last_history
+    if [ $_jjf_rc -ne 0 ] || [ -z "$_jjf_cmd" ]; then
+        return $_jjf_rc
     fi
     history -s -- "$_jjf_cmd"
     sh -c "$_jjf_cmd"

src/init/fish.fish

@@ -9,6 +9,10 @@ function jjf
         command jjf $argv
         return $status
     end
+    # Arm the postexec hook *before* invoking the picker so the original
+    # `jjf …` entry is removed from history on any exit path (cancel, error,
+    # or success). Fish records function invocations *after* return.
+    set -g _jjf_pending_swap 1
     set -l _jjf_cmd (command jjf --emit $argv)
     set -l _jjf_status $status
     if test $_jjf_status -ne 0
@@ -18,9 +22,6 @@ function jjf
         return 130
     end
     builtin history append -- $_jjf_cmd
-    # Signal the postexec hook to remove the literal `jjf …` entry that fish
-    # is about to record (fish records function invocations *after* return).
-    set -g _jjf_pending_swap 1
     sh -c $_jjf_cmd
 end