Fix/wallet balance loading stat

[iwayemi5]

Summary

This PR adds a loading state for wallet balances during network switches to prevent stale balance values from being displayed while new balance data is being fetched.

Changes Made

• Added a network-aware loading state for wallet balances.
• Triggered the loading state immediately when a network switch is detected.
• Prevented stale balance values from being displayed during balance refresh.
• Resolved the loading state once the updated balance is successfully loaded.
• Reused existing balance-fetching logic where possible to avoid duplicate behavior.
• Added test coverage for network switching and balance loading scenarios.

Testing

• Verified that a loading state appears immediately after a network switch.
• Verified that stale balances are not displayed during network transitions.
• Verified that the loading state is cleared once the updated balance becomes available.
• Confirmed existing wallet balance functionality remains unaffected.

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Hey @iwayemi5! 👋 It looks like this PR isn't linked to any issue.

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Issue	Title
#361	Add loading state for wallet balance after network switch	Link to this issue

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