[farquadars]

Summary

Fixes duplicate React keys in the Embedded Wallets sub-navigation bar.

Problem

EMBEDDED_WALLETS_SUBNAV_CONFIG defined three separate navigation links that all used the same key:

{ key: 'connect-blockchain', label: 'EVM', path: '/embedded-wallets/connect-blockchain/evm/' },
{ key: 'connect-blockchain', label: 'Solana', path: '/embedded-wallets/connect-blockchain/solana/' },
{ key: 'connect-blockchain', label: 'Other Blockchains', path: '/embedded-wallets/connect-blockchain/other/' },

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---

> [!NOTE]
> **Low Risk**
> Config-only change to React list keys with no routing or navigation behavior changes.
> 
> **Overview**
> Fixes duplicate React list keys in the Embedded Wallets sub-navigation config. The EVM, Solana, and **Other Blockchains** entries previously shared `key: 'connect-blockchain'`; each now has a distinct key (`connect-blockchain-evm`, `connect-blockchain-solana`, `connect-blockchain-other`). **Labels and URLs are unchanged**—only the keys used when rendering the sub-nav link list are updated.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit 694dd0342033ad30c482d33c689f87b65ea7fc46. Bugbot is set up for automated code reviews on this repo. Configure [here](https://www.cursor.com/dashboard/bugbot).</sup>
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