Fix dashboard drag error (#16731)

Fixes https://github.com/twentyhq/twenty/issues/16730

packages/twenty-front/src/modules/page-layout/hooks/__tests__/usePageLayoutHandleLayoutChange.test.tsx

@@ -52,6 +52,7 @@ describe('usePageLayoutHandleLayoutChange', () => {
     });
 
     expect(result.current.layouts['tab-1']).toEqual(newLayouts);
+    expect(result.current.layouts['tab-1']).not.toBe(newLayouts); // Ensure a clone was set, not the same reference
     expect(result.current.layouts['tab-2']).toBeUndefined();
   });
 

packages/twenty-front/src/modules/page-layout/hooks/usePageLayoutHandleLayoutChange.ts

@@ -48,7 +48,7 @@ export const usePageLayoutHandleLayoutChange = (
 
         set(pageLayoutCurrentLayoutsState, {
           ...currentTabLayouts,
-          [activeTabId]: allLayouts,
+          [activeTabId]: structuredClone(allLayouts),
         });
 
         const pageLayoutDraft = snapshot