Add the Page Loader

Currently, top-level page loading states are fragmented across the application. Each page tends to manage its own loading logic in a non-cohesive manner, leading to inconsistent UX and redundant code.

As part of our new UX orchestration strategy, we need to replace these unique, fragmented implementations with a standardized Page Loader integrated directly into the ff-page component. This loader will be managed via the app store actions to ensure a predictable behavior..