feat(magic-enter plugin): Add support for jj to magic-enter plugin (#13241)

plugins/magic-enter/magic-enter.plugin.zsh

@@ -1,5 +1,6 @@
 # Default commands
 : ${MAGIC_ENTER_GIT_COMMAND:="git status -u ."} # run when in a git repository
+: ${MAGIC_ENTER_JJ_COMMAND:="jj st --no-pager ."} # run when in a jj repository
 : ${MAGIC_ENTER_OTHER_COMMAND:="ls -lh ."}      # run anywhere else
 
 magic-enter() {
@@ -9,7 +10,9 @@ magic-enter() {
     return
   fi
 
-  if command git rev-parse --is-inside-work-tree &>/dev/null; then
+  if command jj st &>/dev/null; then # needs to be before git to handle colocated repositories
+    BUFFER="$MAGIC_ENTER_JJ_COMMAND"
+  elif command git rev-parse --is-inside-work-tree &>/dev/null; then
     BUFFER="$MAGIC_ENTER_GIT_COMMAND"
   else
     BUFFER="$MAGIC_ENTER_OTHER_COMMAND"