fix(wallet): add loading state during network balance refresh

[iwayemi5]

Closes #361

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Summary

This PR adds a loading state for wallet balances during network switches to prevent stale balances from being displayed.

Changes

• Added a network-aware balance hook that immediately clears stale balance data when the active wallet/network balance key changes.
• Updated featured wallet holdings consumers to use the new hook, including:
  • Profile view
  • Mobile holdings bar
  • Trade dialog
• Displayed a loading state while balances are being refreshed after a network switch.
• Disabled trade actions while the current network balance is loading.
• Prevented late responses from previous network requests from overwriting current balance data

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