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>

core/base_repository.py

@@ -248,3 +248,72 @@ class BaseRepository:
                 text(f"UPDATE {self.table} SET sort_order = :order WHERE id = :id"),
                 {"order": (i + 1) * 10, "id": str(id)}
             )
+
+    async def swap_sort_order(self, id_a: str, id_b: str) -> None:
+        """Swap sort_order between two rows."""
+        result = await self.db.execute(
+            text(f"SELECT id, sort_order FROM {self.table} WHERE id IN (:a, :b)"),
+            {"a": str(id_a), "b": str(id_b)},
+        )
+        rows = {str(r._mapping["id"]): r._mapping["sort_order"] for r in result}
+        if len(rows) != 2:
+            return
+        await self.db.execute(
+            text(f"UPDATE {self.table} SET sort_order = :order WHERE id = :id"),
+            {"order": rows[str(id_b)], "id": str(id_a)},
+        )
+        await self.db.execute(
+            text(f"UPDATE {self.table} SET sort_order = :order WHERE id = :id"),
+            {"order": rows[str(id_a)], "id": str(id_b)},
+        )
+
+    async def move_in_order(self, item_id: str, direction: str, filters: dict | None = None) -> None:
+        """Move an item up or down within its sort group.
+
+        Handles lazy initialization (all sort_order=0) and swaps with neighbor.
+        filters: optional dict to scope the group (e.g. {"list_id": some_id}).
+        """
+        where_clauses = ["is_deleted = false"]
+        params: dict[str, Any] = {}
+        if filters:
+            for i, (key, value) in enumerate(filters.items()):
+                if value is None:
+                    where_clauses.append(f"{key} IS NULL")
+                else:
+                    param_name = f"mf_{i}"
+                    where_clauses.append(f"{key} = :{param_name}")
+                    params[param_name] = value
+
+        where_sql = " AND ".join(where_clauses)
+
+        result = await self.db.execute(
+            text(f"SELECT id, sort_order FROM {self.table} WHERE {where_sql} ORDER BY sort_order, created_at"),
+            params,
+        )
+        items = [dict(r._mapping) for r in result]
+        if len(items) < 2:
+            return
+
+        # Lazy init: if all sort_order are 0, assign incremental values
+        if all(r["sort_order"] == 0 for r in items):
+            for i, r in enumerate(items):
+                await self.db.execute(
+                    text(f"UPDATE {self.table} SET sort_order = :order WHERE id = :id"),
+                    {"order": (i + 1) * 10, "id": str(r["id"])},
+                )
+            # Re-fetch
+            result = await self.db.execute(
+                text(f"SELECT id, sort_order FROM {self.table} WHERE {where_sql} ORDER BY sort_order, created_at"),
+                params,
+            )
+            items = [dict(r._mapping) for r in result]
+
+        ids = [str(r["id"]) for r in items]
+        if item_id not in ids:
+            return
+
+        idx = ids.index(item_id)
+        if direction == "up" and idx > 0:
+            await self.swap_sort_order(ids[idx], ids[idx - 1])
+        elif direction == "down" and idx < len(ids) - 1:
+            await self.swap_sort_order(ids[idx], ids[idx + 1])