Add preview templates and update URLs for display sets and series findings

atlas/templates/atlas/partials/_displayset_preview.html

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+<div class="displayset-preview p-2">
+  <h5 class="mb-1">Display Set</h5>
+  <div class="small text-muted mb-2">Case: <a href="{% url 'atlas:case_displaysets' ds.case.pk %}">{{ ds.case.title }}</a></div>
+  <div class="mb-2">Name: {{ ds.name|default:'(unnamed)' }}</div>
+  {% if ds.description %}
+    <div class="mb-2">{{ ds.description }}</div>
+  {% endif %}
+  <div class="d-flex gap-2">
+    <a class="btn btn-sm btn-primary" href="{% url 'atlas:case_displaysets_detail' ds.pk %}">Open full</a>
+    <button class="btn btn-sm btn-outline-secondary view-displayset-modal" data-ds-id="{{ ds.pk }}" data-url="{% url 'atlas:case_displaysets_modal' ds.pk %}">View in modal</button>
+  </div>
+</div>

atlas/templates/atlas/partials/_seriesfinding_preview.html

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+<div class="seriesfinding-preview p-2">
+  <h5 class="mb-1">Series Finding</h5>
+  <div class="small text-muted mb-2">Series: {% if finding.series %}<a href="{% url 'atlas:series_detail' finding.series.pk %}">{{ finding.series.get_block|truncatechars:80 }}</a>{% else %}—{% endif %}</div>
+  <div class="mb-2">{{ finding.description|default:'(no description)' }}</div>
+  {% if finding.findings.all %}
+    <div class="mb-2"><strong>Findings:</strong>
+      <ul class="mb-0">
+        {% for f in finding.findings.all %}
+          <li>{{ f.name }}</li>
+        {% endfor %}
+      </ul>
+    </div>
+  {% endif %}
+  <div class="d-flex gap-2">
+    <a class="btn btn-sm btn-primary" href="{% url 'atlas:series_finding_details' finding.pk %}">Open full</a>
+    <a class="btn btn-sm btn-outline-secondary" href="{% url 'atlas:series_detail' finding.series.pk %}">Open series</a>
+  </div>
+</div>