fix: consistent row styling for capture and focus items

- Remove card-style spacing (margin, border-radius, background) from capture-item and focus-item
- Use border-bottom pattern matching list-row for uniform density
- Wrap capture and focus items in .card containers

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

templates/capture.html

@@ -53,11 +53,12 @@
 </div>
 
 {% if items %}
+<div class="card">
 {% for item in items %}
 
 {# Batch header #}
 {% if item._batch_first and item.import_batch_id %}
-<div class="flex items-center justify-between mb-2 mt-3" style="padding:6px 12px;background:var(--surface2);border-radius:var(--radius-sm)">
+<div class="flex items-center justify-between" style="padding:6px 12px;background:var(--surface2);">
     <span class="text-xs text-muted">Batch &middot; {{ batches[item.import_batch_id|string] }} items</span>
     <form action="/capture/batch/{{ item.import_batch_id }}/undo" method="post" style="display:inline" data-confirm="Delete all items in this batch?">
         <button class="btn btn-ghost btn-xs" style="color:var(--red)">Undo batch</button>
@@ -99,6 +100,7 @@
     {% endif %}
 </div>
 {% endfor %}
+</div>
 {% else %}
 <div class="empty-state">
     <div class="empty-state-icon">&#128229;</div>