{# T-1909: render a clickable arc-membership badge for a task.

   Reads task.arc_id (T-1849 canonical), falls back to scanning task._tags
   for `arc:<slug>` (legacy pre-T-1850; defensive — migration was 162/162
   per T-1850 but cheap to include).

   Renders nothing when no arc is found. The badge links to /arcs/<id>
   which accepts both arc-NNN ids and slugs (lib/arc.sh _resolve_arc_slug).
#}
{% macro arc_badge(task) %}
{%- set _aid = task.arc_id|default("")|string|trim -%}
{%- if not _aid -%}
  {%- for tg in task._tags|default([]) -%}
    {%- if (tg|string).lower().startswith("arc:") and not _aid -%}
      {%- set _aid = (tg|string)[4:] -%}
    {%- endif -%}
  {%- endfor -%}
{%- endif -%}
{%- if _aid -%}
{# T-1969: unified dual-form display "arc-NNN · slug" via arc_display()
   Jinja global. href still uses the raw _aid — lib/arc.sh _resolve_arc_slug
   on the backend accepts either form, so navigation works regardless. #}
{%- set _display = arc_display(_aid) or _aid -%}
<a class="arc-badge" href="/arcs/{{ _aid }}"
   hx-get="/arcs/{{ _aid }}" hx-target="#content" hx-push-url="true"
   title="Arc: {{ _display }}">{{ _display }}</a>
{%- endif -%}
{% endmacro %}