feat(sort-orders): implement separate sort orders for task groupings

- Introduced new columns for `status_sort_order`, `priority_sort_order`, `phase_sort_order`, and `member_sort_order` in the tasks table to maintain distinct sort orders for each grouping type.
- Updated database functions to handle grouping-specific sort orders and avoid unique constraint violations.
- Enhanced backend socket handlers to emit changes based on the selected grouping.
- Modified frontend components to support drag-and-drop functionality with the new sort order fields, ensuring task organization is preserved across different views.
- Added comprehensive migration scripts and verification steps to ensure smooth deployment and backward compatibility.

worklenz-backend/src/socket.io/commands/on-task-sort-order-change.ts

@@ -53,11 +53,30 @@ function notifyStatusChange(socket: Socket, config: Config) {
 }
 
 async function emitSortOrderChange(data: ChangeRequest, socket: Socket) {
+  // Determine which sort column to use based on group_by
+  let sortColumn = 'sort_order';
+  switch (data.group_by) {
+    case 'status':
+      sortColumn = 'status_sort_order';
+      break;
+    case 'priority':
+      sortColumn = 'priority_sort_order';
+      break;
+    case 'phase':
+      sortColumn = 'phase_sort_order';
+      break;
+    case 'members':
+      sortColumn = 'member_sort_order';
+      break;
+    default:
+      sortColumn = 'sort_order';
+  }
+
   const q = `
-    SELECT id, sort_order, completed_at
+    SELECT id, sort_order, ${sortColumn} as current_sort_order, completed_at
     FROM tasks
     WHERE project_id = $1
-    ORDER BY sort_order;
+    ORDER BY ${sortColumn};
   `;
   const tasks = await db.query(q, [data.project_id]);
   socket.emit(SocketEvents.TASK_SORT_ORDER_CHANGE.toString(), tasks.rows);
@@ -84,9 +103,9 @@ export async function on_task_sort_order_change(_io: Server, socket: Socket, dat
         }
       }
 
-      // Use the simple bulk update function
-      const q = `SELECT update_task_sort_orders_bulk($1);`;
-      await db.query(q, [JSON.stringify(data.task_updates)]);
+      // Use the simple bulk update function with group_by parameter
+      const q = `SELECT update_task_sort_orders_bulk($1, $2);`;
+      await db.query(q, [JSON.stringify(data.task_updates), data.group_by || 'status']);
       await emitSortOrderChange(data, socket);
       
       // Handle notifications and logging