Fix Voyager explorer link to use staker address instead of operator address

[Copilot]

The "Validator Index" link in ValidatorList pointed to /staking?validator=[OPERATOR_ACCOUNT] on Voyager, but the Voyager staking page expects the staker account address.

Change

ui/components/ValidatorList.tsx — use v.stakerAddress (the connected wallet / staker account) instead of v.operatorAddress (the on-chain operational_address) in the Voyager href:

- href={getVoyagerUrl(`/staking?validator=${v.operatorAddress}`)}
+ href={getVoyagerUrl(`/staking?validator=${v.stakerAddress}`)}

stakerAddress is the wallet address used to call get_staker_info_v1 on-chain; operatorAddress is the separate operational_address field returned by that contract — a different account not recognized by Voyager's staking lookup.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Link to Explorer page of validator account points to wrong address</issue_title>
<issue_description>The UI link to the explorer page (voyager) points to https://voyager.online/staking?validator=[OPERATOR_ACCOUNT] when it should be pointing to https://voyager.online/staking?validator=[STAKER_ACCOUNT]</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Link to Explorer page of validator account points to wrong address #14

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