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/list_detail.html

@@ -46,6 +46,9 @@
 <div class="card mt-2">
     {% for li in list_items %}
     <div class="list-row {{ 'completed' if li.completed }}">
+        {% with reorder_url="/lists/" ~ item.id ~ "/items/reorder", item_id=li.id %}
+        {% include 'partials/reorder_arrows.html' %}
+        {% endwith %}
         {% if item.list_type == 'checklist' %}
         <div class="row-check">
             <form action="/lists/{{ item.id }}/items/{{ li.id }}/toggle" method="post" style="display:inline">
@@ -68,6 +71,9 @@
     <!-- Child items -->
     {% for child in child_map.get(li.id|string, []) %}
     <div class="list-row {{ 'completed' if child.completed }}" style="padding-left: 48px;">
+        {% with reorder_url="/lists/" ~ item.id ~ "/items/reorder", item_id=child.id, extra_fields={"parent_id": li.id|string} %}
+        {% include 'partials/reorder_arrows.html' %}
+        {% endwith %}
         {% if item.list_type == 'checklist' %}
         <div class="row-check">
             <form action="/lists/{{ item.id }}/items/{{ child.id }}/toggle" method="post" style="display:inline">