Link command menu items to specific page layout (#19706)

- Add a `pageLayoutId` foreign key to `CommandMenuItem`, allowing
command menu items to be scoped to a specific page layout instead of
being globally available
- Filter command menu items by the current page layout on the frontend.
Items with a `pageLayoutId` only appear when viewing that layout, while
items without one remain globally visible
- Create an effect to track the current page layout ID
- Include a seed example: a "Show Notification" command pinned to the
Star history standalone page layout

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

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

@@ -95,7 +95,9 @@ export const useSetIsPageLayoutInEditMode = (pageLayoutIdFromProps: string) => {
 
       store.set(contextStoreIsFullTabWidgetInEditModeState, value);
 
-      store.set(currentPageLayoutIdState.atom, value ? pageLayoutId : null);
+      if (value) {
+        store.set(currentPageLayoutIdState.atom, pageLayoutId);
+      }
     },
     [
       isDashboardInEditModeState,