enhancement: loading state for manage voting power

[MarkNerdi996]

Summary

This PR adds a LoadingState to the account, which is only unset once the voting power transaction is confirmed.

Changelog

- add loading state for voting power
- improve error handling on manage voting power
- make buttons loading 

Issue

Closes #5638

Testing

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Instructions

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Checklist

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• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or modified tests that prove my changes work as intended
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• I have made corresponding changes to the documentation

[Tuditi]

LGTM!