feat(bases): block intra-column drops while sort is active + add hint

apps/client/src/features/base/components/views/kanban/base-kanban.tsx

@@ -248,6 +248,11 @@ export function BaseKanban({
           ))}
         </div>
       )}
+      {sortsActive && (
+        <div className={classes.sortHint}>
+          {t("Sorted — cards within a column can't be reordered.")}
+        </div>
+      )}
       <div className={classes.board}>
         {columns.map((column) => (
           <KanbanColumn
@@ -259,6 +264,7 @@ export function BaseKanban({
             onCardDrop={handleCardDrop}
             onColumnReorder={handleColumnReorder}
             onHide={handleHideColumn}
+            sortsActive={sortsActive}
           />
         ))}
       </div>

apps/client/src/features/base/components/views/kanban/kanban-card.tsx

@@ -14,6 +14,7 @@ type KanbanCardProps = {
   primaryProperty: IBaseProperty | undefined;
   onClick: (rowId: string) => void;
   onDrop: (payload: CardDropPayload) => void;
+  sortsActive: boolean;
 };
 
 export function KanbanCard({
@@ -22,12 +23,14 @@ export function KanbanCard({
   primaryProperty,
   onClick,
   onDrop,
+  sortsActive,
 }: KanbanCardProps) {
   const { t } = useTranslation();
   const { ref, isDragging, closestEdge } = useKanbanCardDrag({
     cardId: row.id,
     columnKey,
     onDrop,
+    sortsActive,
   });
 
   const titleValue = primaryProperty

apps/client/src/features/base/components/views/kanban/kanban-column.tsx

@@ -16,6 +16,7 @@ type KanbanColumnProps = {
   onCardDrop: (payload: CardDropPayload) => void;
   onColumnReorder: (payload: ColumnReorderPayload) => void;
   onHide: (columnKey: string) => void;
+  sortsActive: boolean;
 };
 
 export function KanbanColumn({
@@ -26,6 +27,7 @@ export function KanbanColumn({
   onCardDrop,
   onColumnReorder,
   onHide,
+  sortsActive,
 }: KanbanColumnProps) {
   const { ref: bodyRef, isOver } = useKanbanColumnDrop({
     columnKey: column.key,
@@ -56,6 +58,7 @@ export function KanbanColumn({
             primaryProperty={primaryProperty}
             onClick={onCardClick}
             onDrop={onCardDrop}
+            sortsActive={sortsActive}
           />
         ))}
         <KanbanAddCardButton onClick={() => onAddCard(column.key)} />

apps/client/src/features/base/hooks/use-kanban-card-drag.ts

@@ -28,11 +28,13 @@ export function useKanbanCardDrag({
   cardId,
   columnKey,
   onDrop,
+  sortsActive,
   disabled,
 }: {
   cardId: string;
   columnKey: string;
   onDrop: (payload: CardDropPayload) => void;
+  sortsActive: boolean;
   disabled?: boolean;
 }) {
   const ref = useRef<HTMLDivElement>(null);
@@ -61,7 +63,12 @@ export function useKanbanCardDrag({
         element: el,
         canDrop: ({ source }) => {
           if (source.data.type !== "base-kanban-card") return false;
-          return source.data.cardId !== cardId;
+          if (source.data.cardId === cardId) return false;
+          // Block intra-column drops when a sort is active (the slot would
+          // visibly snap back to the sort's chosen position, confusing the
+          // user). Cross-column drops still work and change the cell value.
+          if (sortsActive && source.data.columnKey === columnKey) return false;
+          return true;
         },
         getData: ({ input, element }) =>
           attachClosestEdge(
@@ -85,7 +92,7 @@ export function useKanbanCardDrag({
         },
       }),
     );
-  }, [cardId, columnKey, disabled]);
+  }, [cardId, columnKey, disabled, sortsActive]);
 
   return { ref, isDragging, closestEdge };
 }