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/focus.html

@@ -14,6 +14,7 @@
 
 <!-- Focus items -->
 {% if items %}
+<div class="card">
 {% for item in items %}
 <div class="focus-item {{ 'completed' if item.completed }}">
     {% with reorder_url="/focus/reorder", item_id=item.id, extra_fields={"focus_date": focus_date|string} %}
@@ -35,6 +36,7 @@
     </form>
 </div>
 {% endfor %}
+</div>
 {% else %}
 <div class="empty-state mb-4"><div class="empty-state-text">No focus items for this day</div></div>
 {% endif %}