feat: universal reorder grip handles and compact UI density

- Add generic move_in_order() to BaseRepository for reorder support
- Add reusable reorder_arrows.html partial with grip dot handles
- Add reorder routes to all 9 list routers (tasks, notes, links, contacts, meetings, decisions, appointments, lists, focus)
- Compact row padding (6px 12px, gap 8px) on .list-row and .focus-item
- Reduce font size to 0.80rem on row titles, sidebar nav, domain tree

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

templates/focus.html

@@ -16,6 +16,9 @@
 {% if items %}
 {% 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} %}
+    {% include 'partials/reorder_arrows.html' %}
+    {% endwith %}
     <form action="/focus/{{ item.id }}/toggle" method="post" style="display:inline">
         <div class="row-check">
             <input type="checkbox" id="f-{{ item.id }}" {{ 'checked' if item.completed }} onchange="this.form.submit()">