fix: KsDataGrid - replicate focusRow complete logic in Enter key handler

- Use exact focusRow pattern: ensureIndexVisible + setFocusedCell + startEditingCell
- Apply retry logic to all three operations
- Ensures next cell gets full focus + edit mode like focusRow

frontend/src/shared/ui/components/KsDataGrid.vue

@@ -118,16 +118,20 @@ function onCellKeyDown(event: any): void {
     event.api.stopEditing(false)
     event.api.tabToNextCell(false)
 
-    const ensureEditMode = () => {
+    const attempt = () => {
       const focusedCell = event.api.getFocusedCell()
       if (focusedCell) {
-        event.api.startEditingCell(focusedCell)
+        const col = focusedCell.column.getColId()
+        const rowIndex = focusedCell.rowIndex
+        event.api.ensureIndexVisible(rowIndex)
+        event.api.setFocusedCell(rowIndex, col)
+        event.api.startEditingCell({ rowIndex, colKey: col })
       }
     }
 
-    ensureEditMode()
-    setTimeout(ensureEditMode, 10)
-    setTimeout(ensureEditMode, 50)
+    attempt()
+    setTimeout(attempt, 10)
+    setTimeout(attempt, 50)
   }
 }