fix: move droppable placeholder back inside innerRef container in Kanban board

https://sonarly.com/issue/17390?type=bug

Kanban board drops only register near the top of target columns because the `@hello-pangea/dnd` placeholder was moved outside the `innerRef` container, breaking the library's droppable area measurement.

Fix: **What changed:**

Moved `droppableProvided.innerRef` and `droppableProvided.droppableProps` from `StyledColumnCardsContainer` (inside the memo boundary) up to `StyledColumn` in `RecordBoardColumn.tsx` (outside the memo boundary). This ensures both the card list and the placeholder are children of the `innerRef` element, which is required by `@hello-pangea/dnd` for correct droppable area measurement.

**RecordBoardColumn.tsx:**
- Added `ref={droppableProvided.innerRef}` and `{...droppableProvided.droppableProps}` to `StyledColumn`
- Removed `droppableProvided` from props passed to `RecordBoardColumnCardsContainer`

**RecordBoardColumnCardsContainer.tsx:**
- Removed `droppableProvided` from component props and type definition
- Removed `ref` and spread of `droppableProps` from `StyledColumnCardsContainer`
- Removed unused `DroppableProvided` type import

**Why this works:**
The `DragAndDropLibraryLegacyReRenderBreaker` (React.memo wrapper) blocks re-renders of the card list during drag — this is the performance optimization from PR #15714. Previously, to work around this, the placeholder was placed outside the `innerRef` container, breaking drop zone detection. By lifting `innerRef` to the parent `StyledColumn`, both the memo'd cards and the placeholder live inside the `innerRef` DOM element, satisfying the library's requirements while preserving the performance optimization.

packages/twenty-front/src/modules/object-record/record-board/record-board-column/components/RecordBoardColumn.tsx

@@ -65,12 +65,15 @@ export const RecordBoardColumn = ({
     >
       <Droppable droppableId={recordBoardColumnId}>
         {(droppableProvided) => (
-          <StyledColumn>
+          <StyledColumn
+            ref={droppableProvided.innerRef}
+            // oxlint-disable-next-line react/jsx-props-no-spreading
+            {...droppableProvided.droppableProps}
+          >
             <DragAndDropLibraryLegacyReRenderBreaker
               memoizationId={recordBoardColumnId}
             >
               <RecordBoardColumnCardsContainer
-                droppableProvided={droppableProvided}
                 recordBoardColumnId={recordBoardColumnId}
               />
             </DragAndDropLibraryLegacyReRenderBreaker>

packages/twenty-front/src/modules/object-record/record-board/record-board-column/components/RecordBoardColumnCardsContainer.tsx

@@ -1,5 +1,5 @@
 import { styled } from '@linaria/react';
-import { Draggable, type DroppableProvided } from '@hello-pangea/dnd';
+import { Draggable } from '@hello-pangea/dnd';
 import { useContext } from 'react';
 import { themeCssVariables } from 'twenty-ui/theme-constants';
 
@@ -25,12 +25,10 @@ const StyledNewButtonContainer = styled.div`
 
 type RecordBoardColumnCardsContainerProps = {
   recordBoardColumnId: string;
-  droppableProvided: DroppableProvided;
 };
 
 export const RecordBoardColumnCardsContainer = ({
   recordBoardColumnId,
-  droppableProvided,
 }: RecordBoardColumnCardsContainerProps) => {
   const { columnDefinition } = useContext(RecordBoardColumnContext);
 
@@ -45,11 +43,7 @@ export const RecordBoardColumnCardsContainer = ({
   );
 
   return (
-    <StyledColumnCardsContainer
-      ref={droppableProvided?.innerRef}
-      // oxlint-disable-next-line react/jsx-props-no-spreading
-      {...droppableProvided?.droppableProps}
-    >
+    <StyledColumnCardsContainer>
       {recordIndexRecordIdsByGroup.map((recordId, index) => (
         <RecordBoardCardDraggableContainer
           key={recordId}