Add loading states across the app

We should add some nice loading states across the app. Ideally, we have some skeletons throughout the app.

The issue mentions adding loading states and skeletons across the app. First, examine the existing UI components to understand the current structure and identify where loading states are needed. Look for API call patterns or data-fetching hooks to determine where to inject loading indicators. Check if there's a design system or component library for skeleton placeholders. 'Done' means consistent loading feedback is implemented in key user flows.

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