[UX] No loading states on data-heavy pages - users see blank screens during fetch

[Siddh2024]

Description

Pages that load blockchain or API data display blank or partially-rendered content while data is being fetched. There are no loading spinners, skeleton screens, or progress indicators.

Impact

• Poor user experience — users don't know content is loading
• May cause users to navigate away assuming the page is broken

Suggested Fix

Add loading states (spinners, skeleton loaders) for all async data operations.

[github-actions]

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