fix(shell): restore always-on PATH after macOS path_helper

path_helper runs after ~/.zshenv in login shells and puts Homebrew ahead of
fnm, pyenv, and ~/.local/bin. Re-source ~/.zshenv from ~/.zprofile and make
prepends idempotent so login and zsh -c resolve the same binaries.

zsh/fnm.zsh

@@ -1,10 +1,30 @@
-# fnm (Fast Node Manager) — always-on (sourced from ~/.zshenv)
+# fnm (Fast Node Manager) — always-on via ~/.zshenv
 FNM_PATH="${XDG_DATA_HOME:-$HOME/.local/share}/fnm"
-[[ -d "$FNM_PATH" ]] && export PATH="$FNM_PATH:$PATH"
+[[ -d "$FNM_PATH" ]] && path=("$FNM_PATH" ${path:#$FNM_PATH})
+
 if command -v fnm &> /dev/null; then
-  if [[ -o interactive ]]; then
-    eval "$(fnm env --use-on-cd --shell zsh)"
-  else
-    eval "$(fnm env --shell zsh)"
+  _easyzsh_fnm_state="${XDG_STATE_HOME:-$HOME/.local/state}/fnm_multishells"
+  _easyzsh_fnm_ready=0
+  if [[ -n "$FNM_MULTISHELL_PATH" && -d "$FNM_MULTISHELL_PATH/bin" ]] \
+      && [[ "$FNM_MULTISHELL_PATH" == "$_easyzsh_fnm_state/"* || "$FNM_MULTISHELL_PATH" == "$FNM_PATH/"* ]]; then
+    if [[ ! -o interactive ]] || (( $+functions[_fnm_autoload_hook] )); then
+      _easyzsh_fnm_ready=1
+    fi
   fi
+  if (( _easyzsh_fnm_ready )); then
+    path=("$FNM_MULTISHELL_PATH/bin" ${path:#$FNM_MULTISHELL_PATH/bin})
+  else
+    _easyzsh_fnm_prev="$FNM_MULTISHELL_PATH"
+    if [[ -o interactive ]]; then
+      eval "$(fnm env --use-on-cd --shell zsh)"
+    else
+      eval "$(fnm env --shell zsh)"
+    fi
+    if [[ -n "$_easyzsh_fnm_prev" ]]; then
+      path=(${path:#$_easyzsh_fnm_prev/bin})
+    fi
+    unset _easyzsh_fnm_prev
+  fi
+  unset _easyzsh_fnm_ready _easyzsh_fnm_state
 fi
+export PATH