feat: migrate brave to the hub

[arlert-armin]

Summary

This PR migrates Brave to the Hub architecture, updating its connection flow and internal integrations to align with the Hub’s standardized capability model. The migration was straightforward, and no limitations were identified.

Key changes:

• Migrated Brave to use the Hub.
• Updated Brave’s flow to align with unified namespace handling.
• Ensured full compatibility with existing state, account management, and connection logic.

No known limitations were found.

Fixes # (issue)

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How did you test this change?

I tested Brave end-to-end under the Hub-managed environment:

• Verified Brave connects successfully through the Hub.

• Confirmed address retrieval and account updates behave as expected.

• Ensured signing and other wallet interactions work correctly.

• Test A

• Test B

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Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Implemented a user interface (UI) change, referencing our Figma design to ensure pixel-perfect precision.