Tracker: unfold a combatant's stat block inline

- extract the 5e stat-block markup into enemy/_statblock.html.twig
  (sb.block(enemy) macro); the enemy detail page now uses it too
- each tracker combatant gets a "stat block" toggle that expands the
  block in place (Bootstrap collapse), so you don't have to leave the
  encounter to check AC / attacks
- open blocks are remembered in localStorage and re-opened after each
  damage/heal reload, and the caret rotates when expanded

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

templates/tracker/show.html.twig

@@ -2,6 +2,8 @@
 
 {% block title %}{{ encounter.name }} · Tracker · dmtools{% endblock %}
 
+{% import 'enemy/_statblock.html.twig' as sb %}
+
 {% block body %}
     <div class="d-flex justify-content-between align-items-start mb-3 gap-3 flex-wrap">
         <div>
@@ -52,8 +54,12 @@
                                     {% if c.isDown %}<span class="badge text-bg-secondary ms-1">Down</span>{% endif %}
                                 </div>
                                 {% if c.enemy %}
-                                    <a href="{{ path('app_enemies_show', {id: c.enemy.id}) }}"
-                                       class="small text-decoration-none text-body-secondary">stat block</a>
+                                    <button type="button"
+                                            class="btn btn-link btn-sm p-0 text-decoration-none text-body-secondary"
+                                            data-bs-toggle="collapse" data-bs-target="#sb-{{ c.id }}"
+                                            aria-expanded="false" aria-controls="sb-{{ c.id }}">
+                                        <span class="sb-caret">&#9656;</span> stat block
+                                    </button>
                                 {% endif %}
                             </div>
 
@@ -85,6 +91,15 @@
                                 </div>
                             </div>
                         </div>
+
+                        {% if c.enemy %}
+                            <div class="collapse statblock-collapse mt-2 pt-2 border-top" id="sb-{{ c.id }}">
+                                <p class="text-body-secondary fst-italic small mb-2">{{ c.enemy.metaLine }}</p>
+                                <div class="small">{{ sb.block(c.enemy) }}</div>
+                                <a href="{{ path('app_enemies_show', {id: c.enemy.id}) }}"
+                                   class="small text-decoration-none">Open full stat block &rarr;</a>
+                            </div>
+                        {% endif %}
                     </div>
                 </div>
             {% endfor %}