{# The navbar's bookmark slot. Rendered into the shell with whatever mark the
   worker holds, and returned on its own by api/bookmark after a write. Both
   paths must produce the same element for the swap to be seamless.

   mark is null in one case only: boot.html composed this page, so there was
   no worker to ask. The slot is then hidden rather than absent and fetches
   itself once app.js reports a worker is controlling -- which is why the htmx
   attributes are on the empty state and not the filled one. A filled slot is
   only ever replaced by the modal's form, which names #bookmark itself.

   Empty state is d-none, not the hidden attribute: Bootstrap declares .d-flex
   after Reboot's [hidden] rule, both !important and at the same specificity,
   so the utility would win. #}
<span class="bookmark navbar-text {% if mark %}d-flex{% else %}d-none{% endif %} align-items-center gap-1"
      id="bookmark"
      {%- if not mark %}
      hx-get="api/bookmark" hx-trigger="worker-ready from:body"
      hx-target="this" hx-swap="outerHTML"
      {%- endif %}>
{%- if mark %}
  {# A word and a colon, not a badge: this is one line of text that happens to
     end in a link, and a pill in front of it read as a control. Outside the
     anchor so that only the reference is underlined -- Reboot underlines an
     <a>, and the label is not the part you can go to. It takes the muted
     navbar colour from .navbar-text on the parent without asking. #}
  <span class="bookmark-label">Bookmark:</span>
  {# Not boosted: a real navigation lets the browser scroll to the verse
     anchor, which a swap into #content would not do. #}
  <a class="bookmark-link link-light text-truncate" href="{{ mark.href }}"
     hx-boost="false">{{ mark.ref }}</a>
{%- endif %}
</span>