Add unending category for session-based games

For games like Dota 2 that have no completion state — shows hours
played on the card, reuses the games fields in the form (hours played
/ total hours), and gets its own cyan badge. No DB column change,
only choices metadata update.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backlogger/templates/backlogger/item_form.html

@@ -252,7 +252,9 @@
 
   function updateSections() {
     document.querySelectorAll('.cat-section').forEach(el => el.style.display = 'none');
-    const sec = document.getElementById('section-' + catSelect.value);
+    const cat = catSelect.value;
+    const secId = cat === 'unending' ? 'section-games' : 'section-' + cat;
+    const sec = document.getElementById(secId);
     if (sec) sec.style.display = 'block';
   }
 

backlogger/templates/backlogger/list.html

@@ -120,6 +120,7 @@
     .badge-games { background: #3b2f6a; color: #a78bfa; }
     .badge-books { background: #064e3b; color: #34d399; }
     .badge-films { background: #431407; color: #fb923c; }
+    .badge-unending { background: #0c3a52; color: #38bdf8; }
     .badge-other { background: #1e293b; color: #94a3b8; }
     .star { color: #fbbf24; font-size: 0.9rem; margin-left: auto; }
 
@@ -233,6 +234,10 @@
           {% if item.pages_read is not None %}
             {{ item.pages_read }} pages{% if item.total_pages %} / {{ item.total_pages }} total{% endif %}
           {% endif %}
+        {% elif item.category == 'unending' %}
+          {% if item.hours_played is not None %}
+            {{ item.hours_played|floatformat:1 }}h played
+          {% endif %}
         {% elif item.category == 'films' %}
           {% if item.watched %}✓ Watched{% else %}○ Not watched{% endif %}{% if item.duration_minutes %}  ·  {{ item.duration_minutes }} min{% endif %}
         {% endif %}