Enhance PickleGlass Web: Added LoadingSpinner component for consisten…

[hamzaMissewi]

…t loading states, updated package.json with a new watch script, and improved README with project overview and features. Refactored activity and details pages to utilize LoadingSpinner for better user experience.

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name: Pull Request
about: Propose a change to the codebase

Summary of Changes

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Related Issue

• Closes #XXX

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