refactor(infra): move currentPageAtom to core (#5332)

Remove `currentPageAtom` from `infra` to `frontend/core.`

packages/common/infra/src/atom/index.ts

@@ -4,4 +4,3 @@ export const loadedPluginNameAtom = atom<string[]>([]);
 
 export * from './root-store';
 export * from './settings';
-export * from './workspace';

packages/common/infra/src/atom/workspace.ts

@@ -1,3 +0,0 @@
-import { atom } from 'jotai';
-
-export const currentPageIdAtom = atom<string | null>(null);