{{- /* Recursively render a heading tree as nested nav lists.
       Params (dict): items (heading slice), parent (parent's full command
       label, "" at the root), depth (1-based), maxDepth (deepest level shown).
       Each label has its parent's command path stripped, so the reference
       reads "auth → login" rather than "auth → auth login". */ -}}
{{- $parent := .parent -}}
{{- $depth := .depth -}}
{{- $maxDepth := .maxDepth -}}
<ul>
  {{- range .items -}}
    {{- $full := partial "nav-label.html" .Title -}}
    {{- $label := $full -}}
    {{- if $parent -}}{{- $label = strings.TrimPrefix (printf "%s " $parent) $full -}}{{- end -}}
    <li>
      <a href="#{{ .ID }}" data-depth="{{ $depth }}">{{ $label }}</a>
      {{- if and (lt $depth $maxDepth) .Headings -}}
        {{- partial "command-nav.html" (dict "items" .Headings "parent" $full "depth" (add $depth 1) "maxDepth" $maxDepth) -}}
      {{- end -}}
    </li>
  {{- end -}}
</ul>