feat(alerts): Steward's own confirm dialog, a verdict-first rules list, and a rule page in three sections (#5314, #5315, #5317)

Confirm dialog (#5314):
- Every data-confirm form now asks in one native <dialog> (base.html + static/confirm.js)
  instead of window.confirm.
- The question becomes the heading and what follows it the detail; the act's
  button is named after the form's own button; Cancel has the focus and Esc
  backs out. Optional data-confirm-title/-detail/-action/-dismiss attributes.
- All 27 existing uses work as they are. Cancelling a run says 'Keep running'.

Alerts list (#5315):
- A verdict line (what is firing, how many rules, where notifications go,
  or 'notifies nobody yet' with a link) replaces the empty Active card.
- Each rule's name opens it; rows show 'last fired' and fold fire/clear into
  the condition; History and Disable stay; Delete leaves the list.
- .docker-verdict becomes the shared .page-verdict.

Rule page (#5317):
- Named for the rule (title and crumb), with when it last fired and how many
  changes of state it holds.
- Three sections: what it watches, when it fires (checks side by side,
  seconds echoed as a duration), what happens (where notifications go, no-data,
  the playbook, whose fields stay folded until ticked).
- Delete at the foot, behind the dialog, saying its history goes with it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/docker/templates/docker/rows.html

@@ -16,7 +16,7 @@
 
 {# ── Verdict ──────────────────────────────────────────────────────────────── #}
 {% set problems = attention|length + failing_services|length %}
-<p class="docker-verdict">
+<p class="page-verdict">
   {% if problems %}<strong class="tone-crit">{{ problems }} need{{ "s" if problems == 1 }} attention</strong>
   {% else %}<strong class="tone-ok">Nothing needs attention</strong>{% endif %}
   {%- if services_total %} · <span class="tone-{{ 'ok' if services_healthy == services_total else 'warn' }}">{{ services_healthy }}/{{ services_total }}</span> services healthy{% endif %}

plugins/docker/templates/docker/swarm.html

@@ -15,7 +15,7 @@
 {% for g in swarms %}
 {% set down_nodes = g.nodes|rejectattr("ok")|list %}
 <section class="swarm-group" aria-label="Swarm reported by {{ g.managers|join(', ') }}">
-  <p class="docker-verdict">
+  <p class="page-verdict">
     {% if down_nodes or g.troubled %}<strong class="tone-crit">{{ down_nodes|length + g.troubled|length }} need{{ "s" if (down_nodes|length + g.troubled|length) == 1 }} attention</strong>
     {% else %}<strong class="tone-ok">Every node is up and taking work</strong>{% endif %}
     · {{ g.nodes|length }} node{{ "s" if g.nodes|length != 1 }}